lets say you borrow $50 from john and another $50 from mike friend and you buy yourself an item for $97 so you have $3 change right? ok  from the $3 you give $1 to john and another $1 to mike so that leaves you owing both $49 equaling to $98 and leaves you with $1.\n\nso adding every thing up gives you $99, your missing $1.....\n\nso heres the problem...\n\n50+50=100\n100-97=3\n50-1=49\n50-1=49\n49+49=98\n1+98=99\n\ncool huh?
135138
you're indeed a filipino!\n\ntry this one...i know the problem is already wrong\nbut this is even better...you'll get the extra dollar!!!!\n\nyou borrow $50 from each of your friend\nbought item worth $97\nyou have $3 left\ngive them $0.50 each\nyou have $2\n\n50 - 0.50 = 49.5\n49.5 x 2 = $99\nyou have the $2 remaining\n\n$99 + $2 ====== $101   TADA!!!!\n\nhehehehe...isn't it genius!!!!
542656
B -- it;s the only one that adds up to $3 and fits the criteria of the problem \nWork backwards to solve it\na = $3.50\nb = $3.00 - 9 is is more than 3 and 3 is 1/2 of 6\nc = $2.50
166913
there was total $30 in which you gave $3 and kept $2 to your self.so,the remaining $25 has to be split beetween the three so each dude gets $8.33.\nso the total would be\n9.33*3+2=30 dollars
292079
There are 4,563 ways to make exactly $100 using $1, $2, $5, $10, $20, $50, and $100 bills.  I made an Excel spreadsheet that found them all, but please don't ask me to list them:)\n\nGood luck.
625528
Okay, I think this is what you're asking: suppose merchant A sells 2 bananas for $5 and merchant B sells 3 bananas for $5. Then one of the merchants gets sick and the other switches to selling 5 bananas for $10, will the other mechant make more or less oney than if he had sold at his original price?\n\nIf merchant A sells at 5 for $10, he will lose money.\nIf merchant B sells at 5 for $10, he will gain money.\n\nJust compute the amount each merchant makes per banana - Merchant A makes $2.50/banana and merchant B makes $1.67/banana (rounded to nearest cent). If they sell 5 for $10, they would make $2/banana.
208325
the other dollar is in your pocket.... you spent $97 dollars and had 3 dollars change... you payed back $2. of the $100.  you spent $97..... no matter how you look at it you had $3. and if you payed back 2 of the $3. the other Dollar is in your pocket.  the equation is 100. - 97 = 3 then 3 - 2 = 1 the dollar is in your pocket
246193
Ok so let's try this:\n\nGuy 1, Guy 2, Guy 3 each pay $15 so:\nGuy 1 = $15\nGuy 2 = $15\nGuy 3 = $15\n\nManager says "$5 too much" and sends the change back ($5) but neither 40 nor 5 divides by 3 into a integer so with an honest waitress the money situation could go like this:\n\nGuy 1 gets back $1, Guy 2 gets back $2, Guy 3 gets $2 and all three get an explanation that $5 doesn't split evenly, sorry. So prior to our waitress taking the $2 you have:\n\nGuy 1 = $15 - $1 = $14\nGuy 2 = $15 - $2 = $13\nGuy 3 = $15 - $2 = $13\ntherefore: $14 + $13 + $13 = $40\n\nOur waitress reasons that our guys want to have spent the same amount of money so she takes a $ each from Guy 2 and Guy 3 to even it out and she takes an extra dollar otherwise she gives back Guy 1 his whole $15 back and Guys 2 and 3 are upset:\n\nGuy 1 = $14\nGuy 2 = $13 + $1 = $14\nGuy 3 = $13 + $1 = $14\ntherefore all three guys have paid $14 each = 3 x $14 = $42\nShe keeps the extra $1 to keep it fair (all guys paid $14)
554401
OOHHH! OHHH!!! I KNOW THE ANSWER TO THIS!!! ok, there is an equation for this, it's    n(n-1)/2.\n\nSo, if there are 100 "techies" then put 100 into the equation.\n\n100(100-1)/2------the equation\n100(99)/2------simplified\n9900/2------- 100*99\n4950-----THE ANSWER!!!\n\nSo, there would be 4950 cards exchanged!\n\nTHIS IS THE ANSWER, I PROMISE YOU!
211063
The waitress calculation is wrong...\n\nYou me and Sally gave the waitress $10 each for a total of $30.\n\nThe waitress gave back $5\n\nWe gave the waitress back $2.\n\nTherefore, the waitress has $30 - $5 + $2 = $27
74428
Here is an answer using mathematics and not deduction, fits all ages and knowledge levels! Ha ha!\n\nLet's denote the amount of 50's by X and the amount of 20's by Y. If she has 32 bills in total, that means X and Y add up to 32. That gives one equation ===> X+Y=32\nThen, total amount of money is 1000, and that is made up of X amounts of 50's and Y amounts of 20's. And that gives us the second equation =====> 50X+20Y=1000 Using simultaneous equation we have....\nX+Y=32 ====> Multiply this by 50 for simplifcation\n50X+20Y=1000\n\nThe new equation from multiplying by 50 will be \n\n50X+50Y=1600     Now simply subtract one from the other\n50X+20Y=1000\n-------------\n0 + 30Y = 600 ======> Y=600/30=20\n\nTherefore, if she has 20 20's and in total if she has 32 bills, she naturally have 12 50's!
38823
it is an improperly formed equation. the clerk may have the $2 but it is relative to the house not the friends.\n\n3x9=27 which is the price paid. the $2 the clerk has is stolen from the till not the friends. so 27+3=30 the 3 being the amount of the refund. so the proper formula is: 3x9+3=25+3+2\n3 friends times $9 + the $3 refund is equal to the price of the beer $25 plus the $3 refund plus the $2 the clerk has.
135128
This is not really a Math question. It's more of a logic question. Think of it this way: The three soldiers had given out 15 dollars. The manager kept 10 dollars, the bell boy kept 2 dollars, and the soldiers got 3 dollars back. Nothing is missing.\n\nThe way in which the question counts the total number of dollars is wrong. Yes, each soldiers only had to pay $4. That's a total of $12. Think about it. These $12 included the $2 that's secretly kept by the bell boy already (Again, $10 to the manager/hotel, $2 to the bell boy). Why count that again? The question is trying to fool you.\n\nThe correct way to count is: 15 dollars were circulating in this whole story. The soldiers paid out $12 and got $3 back. See? There's no missing dollar!\n\nIf you're still a little confused, draw a diagram. It helps.
204154
I did it this way:\n\nI know that 8% of the tota bill is $4.00\nI'm looking for the 100% of the bill... which I'll be naming "X".\nThen, I used the rule of 3:\n\nX   --------   100%\n4.00  -----      8%\n\nX = (4*100)/8\nX = (400)/8\nX = 50\n\nSo... the bill was $50.00\nPlus, the $4.00 tip... The total bill was $54.00\n\nBe sure to say Hi to your math teacher from me!
520498
Just "pair up" the terms.\n\n1 + (5-3) + (9-7) + (13-11) + ... + (2001-1999)\n\n1 + 2 + 2 + 2 + .... + 2 = 1 + 2 * 500 = 1001
57031
Basically: There is an initial $30 charge.  It should have been $25, so $5 must be returned and accounted for.  $3 is given to the 3 friends, $2 is kept by the manager - there you have the $5.  \n\nThe trick to this riddle is that the addition and subtraction are done at the wrong times to misdirect your thinking - and quite successfully for most.  Each of the 3 friends did indeed pay $9, not $10, and as far as the friends are concerned, they paid $27 for the night.  But we know that the clerk will tell us that they were charged only $25 and when you add the $3 returned with the $2 kept by the bellhop, you come up with $30.
163201
nothing...the person who wrote that just took the wrong approach to finding the answer.  the math was just done wrong...\n\n10x3=30 each guy pays 10\n30-3=27 each guy get back one dollar\n27-2=25 the bellman pockets two\nthere are $25 left\n\nin the problem when the counter man keeps two they add it rather than subtract it like they should have
291516
All you have to do is substitute the numbers you are given...\n\n2nd question\nSn=14(1+14)/2\nSn=14*15/2\nSn=210/2\nSn=105\n\nSo for plan A you get 105 dollars and plan B you get $1.05.  You will always get 100 times more money from plan A because the principal is one hundred times greater for the same plan.\n\nThe first question is essentially the same; substitute what you know in to the equation.  The letters are simply place holders for numbers.