At a bookstore, rulers are sold at $6 for 1 ruler. For every 6 rulers a customer pays, an extra ruler will be given free.
- How much will Mrs Choy pay for 13 rulers?
- What is the most number of rulers Mr Hun can get for $95?
(a)
Number of rulers in one set
= 6 + 1
= 7
Cost of a set of 7 rulers
= 6 x 6
= $36
Number of sets
= 13 ÷ 7
= 1 r 6
Amount that Mrs Choy paid
= 1 x 36 + 6 x 6
= 36 + 36
= $72
(b)
Maximum number of sets
= 95 ÷ 36
= 2 r 13
Number of rulers that can be bought with remaining money
= 13 ÷ 6
= 2
Maximum number of rulers
= 7 x 2 + 2
= 16
Answer(s): (a) $72; (b) 16