Fill in the blanks.
Alistair spends
17 of his money on 4 marbles and 3 pencils.
Each pencil costs thrice as much as each marble.
Let the price of 1 marble be 1 u.
- Cost of 1 pencil = _____ 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 marble = 1 u
Cost of 1 pencil = 3 x 1 u = 3 u
(b)
Amount that Alistair has spent
= 4 x 1 u + 3 x 3 u
= 4 u + 9 u
= 13 u
(c)
Fraction of the money he has left
= 1 -
17 =
67 17 of his money = 13 u
67 of his money = 6 x 13 u = 78 u
Amount that Alistair has left = 78 u
(d)
Amount that Alistair has at first
= 13 u + 78 u
= 91 u
Answer(s): (a) 3; (b) 13; (c) 78; (d) 91