I am thinking of 3 consecutive numbers. The first is a multiple of 4, the second is a multiple of 5 and the third is a multiple
2 answers:
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Say that you're thinking of number
You multiply it by 8, and have
You add -1 (i.e., you subtract 1) and have
This equals -17, so you have
Add 1 to both sides
Divide both sides by 8:
So, you were thinking of -2.