Fill in the blanks.
Ahmad spends
12 of his money on 2 buttons and 3 pens.
Each pen costs twice as much as each button.
Let the price of 1 button be 1 u.
- Cost of 1 pen = _____ u
- Amount that Ahmad has spent = _____ u
- Amount that Ahmad has left = _____ u
- Amount that Ahmad has at first = _____ u
(a)
Change X times into units.
Cost of 1 button = 1 u
Cost of 1 pen = 2 x 1 u = 2 u
(b)
Amount that Ahmad 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 -
12 =
12 12 of his money = 8 u
12 of his money = 1 x 8 u = 8 u
Amount that Ahmad has left = 8 u
(d)
Amount that Ahmad has at first
= 8 u + 8 u
= 16 u
Answer(s): (a) 2; (b) 8; (c) 8; (d) 16