At a bookstore, foolscaps are sold at $5 for 1 foolscap. For every 5 foolscaps a customer pays, an extra foolscap will be given free.
- How much will Mrs Tan pay for 20 foolscaps?
- What is the most number of foolscaps Mr Lin can get for $146?
(a)
Number of foolscaps in one set
= 5 + 1
= 6
Cost of a set of 6 foolscaps
= 5 x 5
= $25
Number of sets
= 20 ÷ 6
= 3 r 2
Amount that Mrs Tan paid
= 3 x 25 + 2 x 5
= 75 + 10
= $85
(b)
Maximum number of sets
= 146 ÷ 25
= 5 r 20
Number of foolscaps that can be bought with remaining money
= 20 ÷ 5
= 5
Maximum number of foolscaps
= 6 x 5 + 5
= 35
Answer(s): (a) $85; (b) 35