At a stationery kiosk, notebooks are sold at $5 for 1 notebook. For every 7 notebooks a customer pays, an extra notebook will be given free.
- How much will Mrs Seow pay for 17 notebooks?
- What is the most number of notebooks Mr Chan can get for $81?
(a)
Number of notebooks in one set
= 7 + 1
= 8
Cost of a set of 8 notebooks
= 7 x 5
= $35
Number of sets
= 17 ÷ 8
= 2 r 1
Amount that Mrs Seow paid
= 2 x 35 + 1 x 5
= 70 + 5
= $75
(b)
Maximum number of sets
= 81 ÷ 35
= 2 r 17
Number of notebooks that can be bought with remaining money
= 17 ÷ 5
= 2
Maximum number of notebooks
= 8 x 2 + 2
= 18
Answer(s): (a) $75; (b) 18