At a bookstore, glues are sold at $10 for 1 glue. For every 5 glues a customer pays, an extra glue will be given free.
- How much will Mrs Chen pay for 14 glues?
- What is the most number of glues Mr Kong can get for $123?
(a)
Number of glues in one set
= 5 + 1
= 6
Cost of a set of 6 glues
= 5 x 10
= $50
Number of sets
= 14 ÷ 6
= 2 r 2
Amount that Mrs Chen paid
= 2 x 50 + 2 x 10
= 100 + 20
= $120
(b)
Maximum number of sets
= 123 ÷ 50
= 2 r 14
Number of glues that can be bought with remaining money
= 14 ÷ 10
= 2
Maximum number of glues
= 6 x 2 + 2
= 14
Answer(s): (a) $120; (b) 14