hard · GMAT Quant
For integers a,b,c satisfying 0<=a<12, 0<=b<18, and 0<=c<20, call(a,b,c) compatible if some integer N has remainders a,b,c when divided by 12,18,20, respectively.
How many compatible ordered triples(a,b,c) also satisfy that a+b+c is divisible by 6?
- 10
- 18
- 24
- 30
- 36
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