Adam spends $14.30 on 2 stickers and 3 marbles.
A sticker costs 4 times as much as 1 marble.
- How much does 1 sticker cost?
- How much do 3 stickers cost?
- How much do a marble and 3 stickers cost?
- How much does 1 marble cost less than 3 stickers?
(a)
Let the cheaper item be 1 u.
Cost of 1 marble = 1 u
Cost of 1 sticker = 4 u
Cost of 2 stickers = 2 x 4 u = 8 u
Cost of 3 marbles = 3 x 1 u = 3 u
Total cost of 2 stickers and 3 marbles
= 8 u + 3 u
= 11 u
11 u = 14.30
1 u = 14.30 ÷ 11 = 1.30
Cost of 1 sticker
= 4 u
= 4 x 1.30
= $5.20
(b)
Cost of 3 stickers
= 3 x 5.20
= $15.60
(c)
Cost of 1 marble and 3 stickers
= 1.30 + 15.60
= $16.90
(d)
Cost of 1 marble less than 3 stickers
= 15.60 - 1.30
= $14.30
Answer(s): (a) $5.20; (b) $15.60; (c) $16.90; (d) $14.30