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First, let me address how the word “total” is used in two different contexts here.

1. each of 20 people walked a total of either 2 miles or 5 miles

2. If they walked a total of 76 miles


1: Each of the 20 people walked a certain distance. How much? A total of either 2 miles or 5 miles. Why have they used the word total to talk about one person’s walked distance? Perhaps it wasn’t all just 1 walk. These are the total of their various short walks combined.

2: 76 miles is the total distance covered by the 20 people combined.


I’ll share how I went about it.

Say the number of 2-mile walkers and 5-mile walkers are equal. Then the total distance walked by the 20 people combined would be:
2×10+5×10=70 miles.

But the total distance is 6 miles more (76 - 70 =6).

When I “exchange” one 2-mile walker with one 5-mile walker, the total distance goes up by 3 miles.

To take the distance up by 6 miles, I’m going to make two such exchanges.

That would lead to 10-2 = 8 2-mile walkers and 10+2 = 12 5-mile walkers.

12 - 8 =4. Answer: (B).


I also double checked my answer.

Is 12 x 5 + 8 x 2 =76?

Yup, it is.
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