Fill in the blanks.
Adam spends
13 of his money on 3 coins and 5 beads.
Each bead costs four times as much as each coin.
Let the price of 1 coin be 1 u.
- Cost of 1 bead = _____ u
- Amount that Adam has spent = _____ u
- Amount that Adam has left = _____ u
- Amount that Adam has at first = _____ u
(a)
Change X times into units.
Cost of 1 coin = 1 u
Cost of 1 bead = 4 x 1 u = 4 u
(b)
Amount that Adam has spent
= 3 x 1 u + 5 x 4 u
= 3 u + 20 u
= 23 u
(c)
Fraction of the money he has left
= 1 -
13 =
23 13 of his money = 23 u
23 of his money = 2 x 23 u = 46 u
Amount that Adam has left = 46 u
(d)
Amount that Adam has at first
= 23 u + 46 u
= 69 u
Answer(s): (a) 4; (b) 23; (c) 46; (d) 69