Fill in the blanks.
Abel spends
18 of his money on 5 marbles and 2 buttons.
Each button costs four times as much as each marble.
Let the price of 1 marble be 1 u.
- Cost of 1 button = _____ u
- Amount that Abel has spent = _____ u
- Amount that Abel has left = _____ u
- Amount that Abel has at first = _____ u
(a)
Change X times into units.
Cost of 1 marble = 1 u
Cost of 1 button = 4 x 1 u = 4 u
(b)
Amount that Abel has spent
= 5 x 1 u + 2 x 4 u
= 5 u + 8 u
= 13 u
(c)
Fraction of the money he has left
= 1 -
18 =
78 18 of his money = 13 u
78 of his money = 7 x 13 u = 91 u
Amount that Abel has left = 91 u
(d)
Amount that Abel has at first
= 13 u + 91 u
= 104 u
Answer(s): (a) 4; (b) 13; (c) 91; (d) 104