Fill in the blanks.
Adriel spends
18 of his money on 5 marbles and 4 erasers.
Each eraser costs five times as much as each marble.
Let the price of 1 marble be 1 u.
- Cost of 1 eraser = _____ u
- Amount that Adriel has spent = _____ u
- Amount that Adriel has left = _____ u
- Amount that Adriel has at first = _____ u
(a)
Change X times into units.
Cost of 1 marble = 1 u
Cost of 1 eraser = 5 x 1 u = 5 u
(b)
Amount that Adriel has spent
= 5 x 1 u + 4 x 5 u
= 5 u + 20 u
= 25 u
(c)
Fraction of the money he has left
= 1 -
18 =
78 18 of his money = 25 u
78 of his money = 7 x 25 u = 175 u
Amount that Adriel has left = 175 u
(d)
Amount that Adriel has at first
= 25 u + 175 u
= 200 u
Answer(s): (a) 5; (b) 25; (c) 175; (d) 200