At a stationery shop, glues are sold at $7 for 1 glue. For every 9 glues a customer pays, an extra glue will be given free.
- How much will Mrs Yeo pay for 18 glues?
- What is the most number of glues Mr Ma can get for $139?
(a)
Number of glues in one set
= 9 + 1
= 10
Cost of a set of 10 glues
= 9 x 7
= $63
Number of sets
= 18 ÷ 10
= 1 r 8
Amount that Mrs Yeo paid
= 1 x 63 + 8 x 7
= 63 + 56
= $119
(b)
Maximum number of sets
= 139 ÷ 63
= 2 r 18
Number of glues that can be bought with remaining money
= 18 ÷ 7
= 2
Maximum number of glues
= 10 x 2 + 2
= 22
Answer(s): (a) $119; (b) 22