Question

How many odd multiples of 7 lie between 20 and 999 ? What would be their sum? *

Answer 1

Answer:

The first multiple of 7 after 20 is 21; the last odd multiple smaller than 999 is 987. We can divide this range into 7, because each multiple between these values is 7 units away from the previous one. So, 987–21 = 966. 966 / 7 = 138; the number of multiples is 138+1 or 139..

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