Question

6 Shane's rare book collection contains 40 books.

• He donates 20% of his books to the national library
• He sells 1 of his books to a rare book dealer.
• The remaining books he sells online.
How many books does he sell online?

Answer 1

It’s 20

Explanation:

Answer 2

31

Explanation:

20% of 40 is 0.20·40 = 8.

Shane donates 8 and sells 1 of his books. That leaves him with 40-8-1 = 31 books that he sells online.