Fill in the blanks.
Adam spends
15 of his money on 4 pencils and 3 marbles.
Each marble costs four times as much as each pencil.
Let the price of 1 pencil be 1 u.
- Cost of 1 marble = _____ 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 pencil = 1 u
Cost of 1 marble = 4 x 1 u = 4 u
(b)
Amount that Adam has spent
= 4 x 1 u + 3 x 4 u
= 4 u + 12 u
= 16 u
(c)
Fraction of the money he has left
= 1 -
15 =
45 15 of his money = 16 u
45 of his money = 4 x 16 u = 64 u
Amount that Adam has left = 64 u
(d)
Amount that Adam has at first
= 16 u + 64 u
= 80 u
Answer(s): (a) 4; (b) 16; (c) 64; (d) 80