Question

Miguel reads 24 books in January and 19 in February. If he wants to read 60 books in the first three months, he needs to read nearly books in March.

• A. 20
• B. 15
• C. 40
• D. 30

Answer 1

The correct option is A 20

The total number of books read by Miguel in the first two months is given by $24+19.$

But, this sum is best estimated by $20+20=40.$

$2420+\underset{–}{19}\to +\underset{–}{20}\underset{–}{43}\underset{–}{40}$

$60-43$ is the number of books that he should read in March.

But, this is best estimated by $60-40=20.$

$6060-\underset{–}{43}\to -\underset{–}{40}\underset{–}{17}\underset{–}{20}$

Thus, Miguel needs to read nearly 20 books in March.