Fill in the blanks.
Albert spends
18 of his money on 2 erasers and 3 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 Albert has spent = _____ u
- Amount that Albert has left = _____ u
- Amount that Albert 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 Albert has spent
= 2 x 1 u + 3 x 5 u
= 2 u + 15 u
= 17 u
(c)
Fraction of the money he has left
= 1 -
18 =
78 18 of his money = 17 u
78 of his money = 7 x 17 u = 119 u
Amount that Albert has left = 119 u
(d)
Amount that Albert has at first
= 17 u + 119 u
= 136 u
Answer(s): (a) 5; (b) 17; (c) 119; (d) 136