Fill in the blanks.
Amadeus spends
110 of his money on 2 pens and 2 coins.
Each coin costs five times as much as each pen.
Let the price of 1 pen be 1 u.
- Cost of 1 coin = _____ u
- Amount that Amadeus has spent = _____ u
- Amount that Amadeus has left = _____ u
- Amount that Amadeus has at first = _____ u
(a)
Change X times into units.
Cost of 1 pen = 1 u
Cost of 1 coin = 5 x 1 u = 5 u
(b)
Amount that Amadeus 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 -
110 =
910 110 of his money = 12 u
910 of his money = 9 x 12 u = 108 u
Amount that Amadeus has left = 108 u
(d)
Amount that Amadeus has at first
= 12 u + 108 u
= 120 u
Answer(s): (a) 5; (b) 12; (c) 108; (d) 120