Adam pays $35.30 for 1 marble and 5 stickers.
The marble costs $1.70 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 marbles and 6 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 1.70
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 1.70 + 5 u
= 6 u + 1.70
6 u + 1.70 = 35.30
6 u = 35.30 - 1.70
6 u = 33.60
1 u = 33.60 ÷ 6 = 5.60
Cost of 1 marble
= 5.60 + 1.70
= $7.30
(b)
Cost of 5 marbles and 6 stickers
= 5 x 7.30 + 6 x 5.60
= 36.50 + 33.60
= $70.10
Answer(s): (a) $7.30; (b) $70.10