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?

128

Step-by-step 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

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

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