Fill in the blanks.
Alex spends
19 of his money on 2 stickers and 2 pens.
Each pen costs five times as much as each sticker.
Let the price of 1 sticker be 1 u.
- Cost of 1 pen = _____ u
- Amount that Alex has spent = _____ u
- Amount that Alex has left = _____ u
- Amount that Alex has at first = _____ u
(a)
Change X times into units.
Cost of 1 sticker = 1 u
Cost of 1 pen = 5 x 1 u = 5 u
(b)
Amount that Alex has spent
= 2 x 1 u + 2 x 5 u
= 2 u + 10 u
= 12 u
(c)
Fraction of the money he has left
= 1 -
19 =
89 19 of his money = 12 u
89 of his money = 8 x 12 u = 96 u
Amount that Alex has left = 96 u
(d)
Amount that Alex has at first
= 12 u + 96 u
= 108 u
Answer(s): (a) 5; (b) 12; (c) 96; (d) 108