Mrs Durai wants to buy bookmarks for 3 classes of pupils. There are 35 pupils in each class. For every 4 bookmarks she buys, she gets another one free.
a) How many bookmarks does she need if each pupil gets 1 bookmark?
b) 4 bookmarks cost $2. What is the least amount she needs to pay?
Solution
a) 3 classes x 35 = 105
Answer: She needs 105 bookmarks.
b)
4 bookmarks + 1 free ----- $2
5 bookmarks (total) ----- $2
105 bookmarks divided by 5 ----- 21 (groups of 5 bookmarks)
21 groups of 5 bookmarks ----- 21 x $2 = $42
Answer: She has to pay $42.
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