At a shop, punchers are sold at $10 for 1 puncher. For every 5 punchers a customer pays, an extra puncher will be given free.
- How much will Mrs Choy pay for 19 punchers?
- What is the most number of punchers Mr Heng can get for $131?
(a)
Number of punchers in one set
= 5 + 1
= 6
Cost of a set of 6 punchers
= 5 x 10
= $50
Number of sets
= 19 ÷ 6
= 3 r 1
Amount that Mrs Choy paid
= 3 x 50 + 1 x 10
= 150 + 10
= $160
(b)
Maximum number of sets
= 131 ÷ 50
= 2 r 19
Number of punchers that can be bought with remaining money
= 19 ÷ 10
= 2
Maximum number of punchers
= 6 x 2 + 2
= 14
Answer(s): (a) $160; (b) 14