Fill in the blanks.
Alfred spends
110 of his money on 4 marbles and 5 pens.
Each pen costs thrice as much as each marble.
Let the price of 1 marble be 1 u.
- Cost of 1 pen = _____ u
- Amount that Alfred has spent = _____ u
- Amount that Alfred has left = _____ u
- Amount that Alfred has at first = _____ u
(a)
Change X times into units.
Cost of 1 marble = 1 u
Cost of 1 pen = 3 x 1 u = 3 u
(b)
Amount that Alfred has spent
= 4 x 1 u + 5 x 3 u
= 4 u + 15 u
= 19 u
(c)
Fraction of the money he has left
= 1 -
110 =
910 110 of his money = 19 u
910 of his money = 9 x 19 u = 171 u
Amount that Alfred has left = 171 u
(d)
Amount that Alfred has at first
= 19 u + 171 u
= 190 u
Answer(s): (a) 3; (b) 19; (c) 171; (d) 190