PSLE Perry spent
37 of his money to buy 4 identical markers. He spent the rest of his money to buy another 5 such markers and 3 identical pens.
- What fraction of Perry's money was spent to buy the 3 pens? Give your answer in the simplest form.
- For every 3 pens bought, 1 additional pen was given free. How many pens would Perry get in total if he were to spend all his money to buy pens only?
(a)
Cost of 4 markers =
37 of his money
Cost of 1 marker
=
37 ÷ 4
=
37 x
14 =
328 of his money
Cost of 5 markers
= 5 x
328 =
1528 of his money
Fraction of Perry's money spent to buy the 5 markers and 2 pens
= 1 -
37 =
47 Fraction of Perry's money spent to buy the 3 pens
=
47 -
1528 =
1628 -
1528 =
128 (b)
128 of Perry's money = 3 pens
2828 of Perry's money = 28 x 3 = 84 pens
Number of free pens
= 84 ÷ 3
= 16 r 4
Total number of pens that Perry would get
= 84 + 16
= 100
Answer(s): (a)
128; (b) 100