Fill in the blanks.
Ahmad spends
13 of his money on 2 coins and 4 buttons.
Each button costs thrice as much as each coin.
Let the price of 1 coin be 1 u.
- Cost of 1 button = _____ 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 coin = 1 u
Cost of 1 button = 3 x 1 u = 3 u
(b)
Amount that Ahmad has spent
= 2 x 1 u + 4 x 3 u
= 2 u + 12 u
= 14 u
(c)
Fraction of the money he has left
= 1 -
13 =
23 13 of his money = 14 u
23 of his money = 2 x 14 u = 28 u
Amount that Ahmad has left = 28 u
(d)
Amount that Ahmad has at first
= 14 u + 28 u
= 42 u
Answer(s): (a) 3; (b) 14; (c) 28; (d) 42