Fill in the blanks.
Alfie spends
16 of his money on 3 erasers and 2 marbles.
Each marble costs four times as much as each eraser.
Let the price of 1 eraser be 1 u.
- Cost of 1 marble = _____ u
- Amount that Alfie has spent = _____ u
- Amount that Alfie has left = _____ u
- Amount that Alfie has at first = _____ u
(a)
Change X times into units.
Cost of 1 eraser = 1 u
Cost of 1 marble = 4 x 1 u = 4 u
(b)
Amount that Alfie has spent
= 3 x 1 u + 2 x 4 u
= 3 u + 8 u
= 11 u
(c)
Fraction of the money he has left
= 1 -
16 =
56 16 of his money = 11 u
56 of his money = 5 x 11 u = 55 u
Amount that Alfie has left = 55 u
(d)
Amount that Alfie has at first
= 11 u + 55 u
= 66 u
Answer(s): (a) 4; (b) 11; (c) 55; (d) 66