Fill in the blanks.
Abel spends
15 of his money on 4 pens and 2 erasers.
Each eraser costs twice as much as each pen.
Let the price of 1 pen be 1 u.
- Cost of 1 eraser = _____ 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 pen = 1 u
Cost of 1 eraser = 2 x 1 u = 2 u
(b)
Amount that Abel has spent
= 4 x 1 u + 2 x 2 u
= 4 u + 4 u
= 8 u
(c)
Fraction of the money he has left
= 1 -
15 =
45 15 of his money = 8 u
45 of his money = 4 x 8 u = 32 u
Amount that Abel has left = 32 u
(d)
Amount that Abel has at first
= 8 u + 32 u
= 40 u
Answer(s): (a) 2; (b) 8; (c) 32; (d) 40