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?

  31

Step-by-step 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.

180 square centimeters

step-by-step explanation:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.