Fill in the blanks.
Albert spends
110 of his money on 3 cards and 3 pens.
Each pen costs four times as much as each card.
Let the price of 1 card 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 card = 1 u
Cost of 1 pen = 4 x 1 u = 4 u
(b)
Amount that Albert has spent
= 3 x 1 u + 3 x 4 u
= 3 u + 12 u
= 15 u
(c)
Fraction of the money he has left
= 1 -
110 =
910 110 of his money = 15 u
910 of his money = 9 x 15 u = 135 u
Amount that Albert has left = 135 u
(d)
Amount that Albert has at first
= 15 u + 135 u
= 150 u
Answer(s): (a) 4; (b) 15; (c) 135; (d) 150