At a shop, Roshel paid $86 for 1 stamp and 4 marbles. The stamp cost $6 more than each marble.
- How much is 1 marble?
- How much is 1 stamp?
(a)
Cost of 1 marble = 1 u
Cost of 4 marbles = 4 u
Cost of 1 stamp = 1 u + 6
Total cost of 1 stamp and 4 marbles
= 4 u + 1 u + 6
= 5 u + 6
5 u + 6 = 86
5 u = 86 - 6
5 u = 80
1 u = 80 ÷ 5 = 16
Cost of 1 marble
= 1 u
= $16
(b)
Cost of 1 stamp
= 1 u + 6
= 16 + 6
= $22
Answer(s): (a) $16; (b) $22