Fill in the blanks.
Alfie spends
110 of his money on 3 coins and 2 cards.
Each card costs twice as much as each coin.
Let the price of 1 coin be 1 u.
- Cost of 1 card = _____ u
- Amount that Alfie has spent = _____ u
- Amount that Alfie has left = _____ u
- Amount that Alfie has at first = _____ u
(a)
Change X times into units.
Cost of 1 coin = 1 u
Cost of 1 card = 2 x 1 u = 2 u
(b)
Amount that Alfie has spent
= 3 x 1 u + 2 x 2 u
= 3 u + 4 u
= 7 u
(c)
Fraction of the money he has left
= 1 -
110 =
910 110 of his money = 7 u
910 of his money = 9 x 7 u = 63 u
Amount that Alfie has left = 63 u
(d)
Amount that Alfie has at first
= 7 u + 63 u
= 70 u
Answer(s): (a) 2; (b) 7; (c) 63; (d) 70