Fill in the blanks.
Andrew spends
16 of his money on 3 buttons and 5 marbles.
Each marble costs four times as much as each button.
Let the price of 1 button be 1 u.
- Cost of 1 marble = _____ 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 button = 1 u
Cost of 1 marble = 4 x 1 u = 4 u
(b)
Amount that Andrew 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 -
16 =
56 16 of his money = 23 u
56 of his money = 5 x 23 u = 115 u
Amount that Andrew has left = 115 u
(d)
Amount that Andrew has at first
= 23 u + 115 u
= 138 u
Answer(s): (a) 4; (b) 23; (c) 115; (d) 138