Kylie was saving money to buy pens. She saved $3 every 7 days. After saving for 112 days, she went to buy pens that were on sale.
- What was the most number of pens she could buy?
- Kylie wanted to buy 44 pens. How much more did she need to save?
(a)
Number of sets of 7 days
= 112 ÷ 7
= 16
Amount that Kylie saved in 112 days
= 16 x 3
= $48
Maximum number of sets of 8 pens that Kylie could buy
= 48 ÷ 10
= 4 r $8
Remaining amount left after buying sets of 8 pens = $8
Maximum number of sets of 4 pens that Kylie could buy with $8
= 8 ÷ 6
= 1 r $2
Remaining amount left after buying sets of 4 pens = $2
Maximum number of pens that Kylie could buy with $2
= 2 ÷ 2
= 1
Most number of pens that Kylie could buy
= 4 x 8 + 1 x 4 + 1
= 32 + 4 + 1
= 37
(b)
Number of sets of 8 pens that Kylie could buy
= 44 ÷ 8
= 5 r 4
Number of sets of 4 pens that Kylie could buy
= 4 ÷ 4
= 1 r 0
Amount that Kylie needed to buy 44 pens
= 5 x 10 + 1 x 6
= 50 + 6
= $56
Amount that Kylie needed to save more
= 56 - 48
= $8
Answer(s): (a) 37; (b) $8
