what 3 digit # is divisable by 3, the 10s dig. is 3 times the 100s dig.-sum is15-If dig. rev. # divis, by 6&3?
966339
100a + 10b + c = N\nb = 3a\na + b + c = 15\nThe reverse being divisible by 2, a must be even\nsince b = 3a and b must be an integer,\na = 2\nb = 6\nc = 15 - 8 = 7\nN = 267
1049978
3x10^2 = 300 because 10^2 = 100\n3 x 10^(-1) = .3 because 10^(-1) = 1/10^1 = 1/10 = .1\n4 x 10^(-4) = .0004 because 10^(-4) = 1/10^4 = 1/10000 = .0001\n\nAll together it's 300.3004
817139
10 digits ^ 3 dials = 10 * 10 * 10 = 1000 possibilities\n\n~ ♥ ~
1055246
Some simple tests to try out first:\n\n1. is the last digit is 5? (divisible by 5)\n\n2. do the digits sum to a multiple of 3? (divisible by 3)\n\n3. add all the digits in even positions (2nd, 4th, etc)\n    add all the digits in odd positions (1st, 3rd, etc)\n    subtract the 2 numbers\n    is this a multiple of 11?\n    e.g. given 9581: (9+8) - (5+1) = 17-6 = 11\n\nIf the answer to any of these is "yes", you have a composite number.\n\nIf not, tought luck! you will have to try dividing it by all odd numbers from 3 to half of the number (well, actually square-root of the number)\n\nAs an aside: try researching the term "recursion"
1045150
well, the only single digit cubes are 1 and 8. To take three and get a sum of 10, you need 1,1 and 8. Arranging these palidromically is left as an exercise for the reader
959917
You are looking for the number that, when multiplied by itself 3 times will equal 10.\n\nFor example, 2x2x2= 8\nand 3x3x3 = 27\n\nso your answer has to be between 2 and 3, closer to 2.\n\nThe value is actually about 2.15443469, and can be found on most calculators as follows:\n\n1) 10\n\n2) 2nd or Inv\n\n.   .  .  Y\n3) X . .     (X with Y superscripted - may be reversed - or may be ^ symbol)\n\n4) 3\n\n5) =\n\nSome calculators make you put the 10 in last.\n\nGood luck
779777
let x=0.7333333333...........\n10x=7.333333333333...............................\n100x=73.333333333333\nsubtracting2 from 3\n90x=66\nx=66/90\n=11/15
250820
you divide the 3 digits by the 2 digits!
343578
you search for a common factor, 2s,3s,5s and 10s are the most apparent. Once you look to a number you can immediately decide if it is divisible by 2 ( if the number is even) or by 3 (if the total of the digits is divisble by 3 i.e 168 total = 15 divisible by 3), or by 5 ( the last digit is 0 or 5) or divisble by 10 ( the last digit is 0).. good luck
836949
With all good things like this you need to state the obvious first.\n\nA number divides by 3 if the remainder is zero if it divides by 3.\n\nFor numbers less than 10 this is obviously 3,6 and 9.\n\nLook at remainders of 10,20 and 30 when divided by 3. 1,2 and zero respectively.  Also notice that if you add two numbers together then to find the remainder when divided by three you only need to add remainders. So for example13 can be written as 10 + 3.  Looking only at remainders this is 1+0 =1 so the remainder when 13 is divided by 3 is 1.  You can reduce a number by 30 without affecting the remainder so higher numbers such as 50 can be reduced by 30 without affecting the remainder.  So you can see how numbers below 100 can be checked this way.\n\nNext notice that a number whose leading digit is one followed by zeros must have remainder 1 when divided by 3.  Take one from this number to get a digit whose numbers are all 9 and this is obviously divisible by 3.  This fact allows us to extend the reasoning we went through for 10, 20 etc to all higher numbers.\n\nThis explanation may be a bit hard going but hopefully it will be some sort of inspiration for your understanding.
842088
111 is divisible by 3 (plus others) so is not a prime\n63  is divisible by 3 (plus others) so is not a prime\n15 is divisible by 3 (plus others) so is not a prime\n41 and 43 are twin primes
159634
well lets seeee.... 1 + 3 = 4 and 4 + 6 = 10, so next would be 10 + 9 = ... well i'll just leave that part to you!!
23639
I depends on what the last # is if it continues as a 1 then the answer is 3
56274
In a base 3 group, 1+2=10 because there are only 3 digits to express any amount: 0, 1 and 2.\n\nMaybe not the answer you are looking for, but, what the heck, in math terms is completely correct :D
793566
10 - 7 = 3\n\ntherefore 3 x 4 (for the 1/4) = 12\n the number is 12
90506
I'll take it as far as I can.\n\n3 - Add all the numbers and if the result is divisible by 3 then the entire number is 9+1+2+0+3+1+2=18 which is divisible by 3.\n4 - The last 2 numbers are divisible by 4. 12 is divisible by 4 so the entire number is.\n6 - It's divisible by 2 and 3.\n8 - If the last 3 numbers are divisible by 8, then the entire number is. 312/8=39. \n9 - Like for 3, except it has to be divisible by 9. The result, from above, is 18 which is divisible by 9.\n12 - If divisible by 3 and 4.\n18 - If divisible by 2 and 9.\n24 - If divisible by 8 and 3.\n36 - If divisible by 4 and 9.\n72 - If divisible by 8 and 9.
146728
no, it is divisible by 1, 3, 23, 29, and itself (with the numbers being reduced as far as possible)