Fill in the blanks.
Andrew spends
15 of his money on 3 erasers and 4 pens.
Each pen costs five times as much as each eraser.
Let the price of 1 eraser be 1 u.
- Cost of 1 pen = _____ 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 eraser = 1 u
Cost of 1 pen = 5 x 1 u = 5 u
(b)
Amount that Andrew has spent
= 3 x 1 u + 4 x 5 u
= 3 u + 20 u
= 23 u
(c)
Fraction of the money he has left
= 1 -
15 =
45 15 of his money = 23 u
45 of his money = 4 x 23 u = 92 u
Amount that Andrew has left = 92 u
(d)
Amount that Andrew has at first
= 23 u + 92 u
= 115 u
Answer(s): (a) 5; (b) 23; (c) 92; (d) 115