At a bookstore, pencils are sold at $7 for 1 pencil. For every 5 pencils a customer pays, an extra pencil will be given free.
- How much will Mrs Chua pay for 8 pencils?
- What is the most number of pencils Mr Ma can get for $104?
(a)
Number of pencils in one set
= 5 + 1
= 6
Cost of a set of 6 pencils
= 5 x 7
= $35
Number of sets
= 8 ÷ 6
= 1 r 2
Amount that Mrs Chua paid
= 1 x 35 + 2 x 7
= 35 + 14
= $49
(b)
Maximum number of sets
= 104 ÷ 35
= 2 r 8
Number of pencils that can be bought with remaining money
= 8 ÷ 7
= 2
Maximum number of pencils
= 6 x 2 + 2
= 14
Answer(s): (a) $49; (b) 14