PSLE Oscar spent
25 of his money to buy 3 identical notebooks. He spent the rest of his money to buy another 4 such notebooks and 3 identical files.
- What fraction of Oscar's money was spent to buy the 3 files? Give your answer in the simplest form.
- For every 5 files bought, 1 additional file was given free. How many files would Oscar get in total if he were to spend all his money to buy files only?
(a)
Cost of 3 notebooks =
25 of his money
Cost of 1 notebook
=
25 ÷ 3
=
25 x
13 =
215 of his money
Fraction of Oscar's money spent to buy the 4 notebooks and 2 files
= 1 -
25 =
35 Cost of 4 notebooks
= 4 x
215 =
815 of his money
Fraction of Oscar's money spent to buy the 3 files
=
35 -
815 =
915 -
815 =
115 (b)
115 of Oscar's money = 3 files
1515 of Oscar's money = 15 x 3 = 45 files
Number of free files
= 45 ÷ 5
= 11 r 1
Total number of files that Oscar would get
= 45 + 11
= 56
Answer(s): (a)
115; (b) 56