Fill in the blanks.
Adrian spends
12 of his money on 5 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 Adrian has spent = _____ u
- Amount that Adrian has left = _____ u
- Amount that Adrian 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 Adrian has spent
= 5 x 1 u + 4 x 5 u
= 5 u + 20 u
= 25 u
(c)
Fraction of the money he has left
= 1 -
12 =
12 12 of his money = 25 u
12 of his money = 1 x 25 u = 25 u
Amount that Adrian has left = 25 u
(d)
Amount that Adrian has at first
= 25 u + 25 u
= 50 u
Answer(s): (a) 5; (b) 25; (c) 25; (d) 50