Fill in the blanks.
Ahmad spends
17 of his money on 5 pencils and 4 marbles.
Each marble costs four times as much as each pencil.
Let the price of 1 pencil be 1 u.
- Cost of 1 marble = _____ 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 pencil = 1 u
Cost of 1 marble = 4 x 1 u = 4 u
(b)
Amount that Ahmad has spent
= 5 x 1 u + 4 x 4 u
= 5 u + 16 u
= 21 u
(c)
Fraction of the money he has left
= 1 -
17 =
67 17 of his money = 21 u
67 of his money = 6 x 21 u = 126 u
Amount that Ahmad has left = 126 u
(d)
Amount that Ahmad has at first
= 21 u + 126 u
= 147 u
Answer(s): (a) 4; (b) 21; (c) 126; (d) 147