Fill in the blanks.
Alan spends
12 of his money on 2 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 Alan has spent = _____ u
- Amount that Alan has left = _____ u
- Amount that Alan 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 Alan has spent
= 2 x 1 u + 3 x 3 u
= 2 u + 9 u
= 11 u
(c)
Fraction of the money he has left
= 1 -
12 =
12 12 of his money = 11 u
12 of his money = 1 x 11 u = 11 u
Amount that Alan has left = 11 u
(d)
Amount that Alan has at first
= 11 u + 11 u
= 22 u
Answer(s): (a) 3; (b) 11; (c) 11; (d) 22