PSLE Vaidev used
47 of his money to buy 12 pencils. He used the rest of his money to buy 8 pencils and 3 pens.
- What fraction of his money did Vaidev use to buy the 3 pens?
- If 1 pen was given for free for every 4 pens bought, how many pens would Vaidev be able to buy if he were to use all his money to buy pens?
(a)
Fraction of his money used to buy 8 pencils and 3 pens
= 1 -
47 =
37 12 pencils →
47 of his money
1 pen →
47 ÷ 12 =
121 of his money
8 pencils → 8 x
121 =
821 of his money
8 pencils + 3 pens →
37 of his money
3 pens →
37 -
821 =
921 -
821 =
121 of his money
(b)
3 pens →
1211 pen →
121 ÷ 3 =
163 of his money
If 1 pen cost
163 of his money, Vaidev could buy 63 pens (Not including the free ones).
Number of free pens that Vaidev could get
= 63 ÷ 4
= 15 r 3
Total number of pens that Vaidev could get
= 63 + 15
= 78
Answer(s): (a)
121; (b) 78