At a shop, Min paid $15 for 1 marble and 8 beads. The marble cost $6 more than each bead.
- How much is 1 bead?
- How much is 1 marble?
(a)
Cost of 1 bead = 1 u
Cost of 8 beads = 8 u
Cost of 1 marble = 1 u + 6
Total cost of 1 marble and 8 beads
= 8 u + 1 u + 6
= 9 u + 6
9 u + 6 = 15
9 u = 15 - 6
9 u = 9
1 u = 9 ÷ 9 = 1
Cost of 1 bead
= 1 u
= $1
(b)
Cost of 1 marble
= 1 u + 6
= 1 + 6
= $7
Answer(s): (a) $1; (b) $7