Question

At the book fair 32 books were sold in the first 2.5 hours. At this rate, how many books will be sold in the 10 hours of the book fair?

Answer 1

128

Explanation:

set up a proportion of # books sold/hours = # books sold/hours

let 'b' = # books sold

32/2.5 = b/10

cross-multply to get:

2.5b = 320

b = 320/2.5

b = 128