At a store, foolscaps are sold at $5 for 1 foolscap. For every 7 foolscaps a customer pays, an extra foolscap will be given free.
- How much will Mrs Lau pay for 17 foolscaps?
- What is the most number of foolscaps Mr Lu can get for $113?
(a)
Number of foolscaps in one set
= 7 + 1
= 8
Cost of a set of 8 foolscaps
= 7 x 5
= $35
Number of sets
= 17 ÷ 8
= 2 r 1
Amount that Mrs Lau paid
= 2 x 35 + 1 x 5
= 70 + 5
= $75
(b)
Maximum number of sets
= 113 ÷ 35
= 3 r 17
Number of foolscaps that can be bought with remaining money
= 17 ÷ 5
= 3
Maximum number of foolscaps
= 8 x 3 + 3
= 27
Answer(s): (a) $75; (b) 27