At a book shop, glues are sold at $8 for 1 glue. For every 7 glues a customer pays, an extra glue will be given free.
- How much will Mrs Yeo pay for 17 glues?
- What is the most number of glues Mr Koh can get for $120?
(a)
Number of glues in one set
= 7 + 1
= 8
Cost of a set of 8 glues
= 7 x 8
= $56
Number of sets
= 17 ÷ 8
= 2 r 1
Amount that Mrs Yeo paid
= 2 x 56 + 1 x 8
= 112 + 8
= $120
(b)
Maximum number of sets
= 120 ÷ 56
= 2 r 17
Number of glues that can be bought with remaining money
= 17 ÷ 8
= 2
Maximum number of glues
= 8 x 2 + 2
= 18
Answer(s): (a) $120; (b) 18