Fill in the blanks.
Alan spends
18 of his money on 5 pencils and 2 cards.
Each card costs thrice as much as each pencil.
Let the price of 1 pencil be 1 u.
- Cost of 1 card = _____ 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 pencil = 1 u
Cost of 1 card = 3 x 1 u = 3 u
(b)
Amount that Alan has spent
= 5 x 1 u + 2 x 3 u
= 5 u + 6 u
= 11 u
(c)
Fraction of the money he has left
= 1 -
18 =
78 18 of his money = 11 u
78 of his money = 7 x 11 u = 77 u
Amount that Alan has left = 77 u
(d)
Amount that Alan has at first
= 11 u + 77 u
= 88 u
Answer(s): (a) 3; (b) 11; (c) 77; (d) 88