PSLE Mark spent
13 of his money to buy 3 identical staplers. He spent the rest of his money to buy another 5 such staplers and 2 identical files.
- What fraction of Mark's money was spent to buy the 2 files? Give your answer in the simplest form.
- For every 6 files bought, 1 additional file was given free. How many files would Mark get in total if he were to spend all his money to buy files only?
(a)
Cost of 3 staplers =
13 of his money
Cost of 1 stapler
=
13 ÷ 3
=
13 x
13 =
19 of his money
Cost of 5 staplers
= 5 x
19 =
59 of his money
Fraction of Mark's money spent to buy the 5 staplers and 2 files
= 1 -
13 =
23 Fraction of Mark's money spent to buy the 2 files
=
23 -
59 =
69 -
59 =
19 (b)
19 of Mark's money = 2 files
99 of Mark's money = 9 x 2 = 18 files
Number of free files
= 18 ÷ 6
= 3 r 3
Total number of files that Mark would get
= 18 + 3
= 21
Answer(s): (a)
19; (b) 21