Question

robert is trying to collect all the cards of a special collectors edition set of hockey cards. He has 18 cards, which is 40% of the set. How many cards are in the selection? How many more cards does he need?

Answer 1

Answer:

27

18 is 40% have 18 is 9 9 is 20% 18 + 9 equals 27 and you already have 40 18 + 18 is 80% all you need is 20 more percent which is 9