At a stationery shop, files are sold at $7 for 1 file. For every 6 files a customer pays, an extra file will be given free.
- How much will Mrs Neo pay for 10 files?
- What is the most number of files Mr Long can get for $113?
(a)
Number of files in one set
= 6 + 1
= 7
Cost of a set of 7 files
= 6 x 7
= $42
Number of sets
= 10 ÷ 7
= 1 r 3
Amount that Mrs Neo paid
= 1 x 42 + 3 x 7
= 42 + 21
= $63
(b)
Maximum number of sets
= 113 ÷ 42
= 2 r 10
Number of files that can be bought with remaining money
= 10 ÷ 7
= 2
Maximum number of files
= 7 x 2 + 2
= 16
Answer(s): (a) $63; (b) 16