Fill in the blanks.
Alfred spends
13 of his money on 2 pencils and 2 buttons.
Each button costs twice as much as each pencil.
Let the price of 1 pencil be 1 u.
- Cost of 1 button = _____ 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 pencil = 1 u
Cost of 1 button = 2 x 1 u = 2 u
(b)
Amount that Alfred has spent
= 2 x 1 u + 2 x 2 u
= 2 u + 4 u
= 6 u
(c)
Fraction of the money he has left
= 1 -
13 =
23 13 of his money = 6 u
23 of his money = 2 x 6 u = 12 u
Amount that Alfred has left = 12 u
(d)
Amount that Alfred has at first
= 6 u + 12 u
= 18 u
Answer(s): (a) 2; (b) 6; (c) 12; (d) 18