Fill in the blanks.
Albert spends
110 of his money on 5 marbles and 2 pens.
Each pen costs four times as much as each marble.
Let the price of 1 marble 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 marble = 1 u
Cost of 1 pen = 4 x 1 u = 4 u
(b)
Amount that Albert has spent
= 5 x 1 u + 2 x 4 u
= 5 u + 8 u
= 13 u
(c)
Fraction of the money he has left
= 1 -
110 =
910 110 of his money = 13 u
910 of his money = 9 x 13 u = 117 u
Amount that Albert has left = 117 u
(d)
Amount that Albert has at first
= 13 u + 117 u
= 130 u
Answer(s): (a) 4; (b) 13; (c) 117; (d) 130