Fill in the blanks.
Adrian spends
110 of his money on 2 stickers and 3 marbles.
Each marble costs twice as much as each sticker.
Let the price of 1 sticker be 1 u.
- Cost of 1 marble = _____ 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 sticker = 1 u
Cost of 1 marble = 2 x 1 u = 2 u
(b)
Amount that Adrian has spent
= 2 x 1 u + 3 x 2 u
= 2 u + 6 u
= 8 u
(c)
Fraction of the money he has left
= 1 -
110 =
910 110 of his money = 8 u
910 of his money = 9 x 8 u = 72 u
Amount that Adrian has left = 72 u
(d)
Amount that Adrian has at first
= 8 u + 72 u
= 80 u
Answer(s): (a) 2; (b) 8; (c) 72; (d) 80