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Question about challenge Q explanation [#permalink]
17 May 2007, 09:31
The question is: "How many three-digit numbers are there, so that each is evenly divisible by 7?"
The explanation listed out 4 easy steps to find the answer:
1. Find the highest and lowest multiples within the range
2. Find the positive difference of these two numbers
3. Divide the difference by the number in the question (in this case, 7)
4. Add +1
My question is: Does this work all the time? How reliable are these steps with different questions?