Fill in the blanks.
Andrew spends
18 of his money on 4 beads and 4 coins.
Each coin costs twice as much as each bead.
Let the price of 1 bead be 1 u.
- Cost of 1 coin = _____ u
- Amount that Andrew has spent = _____ u
- Amount that Andrew has left = _____ u
- Amount that Andrew has at first = _____ u
(a)
Change X times into units.
Cost of 1 bead = 1 u
Cost of 1 coin = 2 x 1 u = 2 u
(b)
Amount that Andrew has spent
= 4 x 1 u + 4 x 2 u
= 4 u + 8 u
= 12 u
(c)
Fraction of the money he has left
= 1 -
18 =
78 18 of his money = 12 u
78 of his money = 7 x 12 u = 84 u
Amount that Andrew has left = 84 u
(d)
Amount that Andrew has at first
= 12 u + 84 u
= 96 u
Answer(s): (a) 2; (b) 12; (c) 84; (d) 96