Fill in the blanks.
Andrew spends
17 of his money on 4 erasers and 5 pencils.
Each pencil costs twice as much as each eraser.
Let the price of 1 eraser be 1 u.
- Cost of 1 pencil = _____ u
- Amount that Andrew has spent = _____ u
- Amount that Andrew has left = _____ u
- Amount that Andrew has at first = _____ u
(a)
Change X times into units.
Cost of 1 eraser = 1 u
Cost of 1 pencil = 2 x 1 u = 2 u
(b)
Amount that Andrew has spent
= 4 x 1 u + 5 x 2 u
= 4 u + 10 u
= 14 u
(c)
Fraction of the money he has left
= 1 -
17 =
67 17 of his money = 14 u
67 of his money = 6 x 14 u = 84 u
Amount that Andrew has left = 84 u
(d)
Amount that Andrew has at first
= 14 u + 84 u
= 98 u
Answer(s): (a) 2; (b) 14; (c) 84; (d) 98