At a book shop, pens are sold at $5 for 1 pen. For every 7 pens a customer pays, an extra pen will be given free.
- How much will Mrs Kong pay for 14 pens?
- What is the most number of pens Mr Yap can get for $82?
(a)
Number of pens in one set
= 7 + 1
= 8
Cost of a set of 8 pens
= 7 x 5
= $35
Number of sets
= 14 ÷ 8
= 1 r 6
Amount that Mrs Kong paid
= 1 x 35 + 6 x 5
= 35 + 30
= $65
(b)
Maximum number of sets
= 82 ÷ 35
= 2 r 14
Number of pens that can be bought with remaining money
= 14 ÷ 5
= 2
Maximum number of pens
= 8 x 2 + 2
= 18
Answer(s): (a) $65; (b) 18