Adam pays $19.10 for 1 marble and 5 stickers.
The marble costs $2.30 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 + 2.30
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 2.30 + 5 u
= 6 u + 2.30
6 u + 2.30 = 19.10
6 u = 19.10 - 2.30
6 u = 16.80
1 u = 16.80 ÷ 6 = 2.80
Cost of 1 marble
= 2.80 + 2.30
= $5.10
(b)
Cost of 5 marbles and 6 stickers
= 5 x 5.10 + 6 x 2.80
= 25.50 + 16.80
= $42.30
Answer(s): (a) $5.10; (b) $42.30