Fill in the blanks.
Alistair spends
16 of his money on 4 pens and 3 buttons.
Each button costs twice as much as each pen.
Let the price of 1 pen be 1 u.
- Cost of 1 button = _____ u
- Amount that Alistair has spent = _____ u
- Amount that Alistair has left = _____ u
- Amount that Alistair has at first = _____ u
(a)
Change X times into units.
Cost of 1 pen = 1 u
Cost of 1 button = 2 x 1 u = 2 u
(b)
Amount that Alistair has spent
= 4 x 1 u + 3 x 2 u
= 4 u + 6 u
= 10 u
(c)
Fraction of the money he has left
= 1 -
16 =
56 16 of his money = 10 u
56 of his money = 5 x 10 u = 50 u
Amount that Alistair has left = 50 u
(d)
Amount that Alistair has at first
= 10 u + 50 u
= 60 u
Answer(s): (a) 2; (b) 10; (c) 50; (d) 60