Fill in the blanks.
Alfie spends
18 of his money on 3 buttons and 2 erasers.
Each eraser costs five times as much as each button.
Let the price of 1 button be 1 u.
- Cost of 1 eraser = _____ 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 button = 1 u
Cost of 1 eraser = 5 x 1 u = 5 u
(b)
Amount that Alfie has spent
= 3 x 1 u + 2 x 5 u
= 3 u + 10 u
= 13 u
(c)
Fraction of the money he has left
= 1 -
18 =
78 18 of his money = 13 u
78 of his money = 7 x 13 u = 91 u
Amount that Alfie has left = 91 u
(d)
Amount that Alfie has at first
= 13 u + 91 u
= 104 u
Answer(s): (a) 5; (b) 13; (c) 91; (d) 104