Fill in the blanks.
Amadeus spends
17 of his money on 3 coins and 2 erasers.
Each eraser costs five times as much as each coin.
Let the price of 1 coin be 1 u.
- Cost of 1 eraser = _____ 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 coin = 1 u
Cost of 1 eraser = 5 x 1 u = 5 u
(b)
Amount that Amadeus has spent
= 3 x 1 u + 2 x 5 u
= 3 u + 10 u
= 13 u
(c)
Fraction of the money he has left
= 1 -
17 =
67 17 of his money = 13 u
67 of his money = 6 x 13 u = 78 u
Amount that Amadeus has left = 78 u
(d)
Amount that Amadeus has at first
= 13 u + 78 u
= 91 u
Answer(s): (a) 5; (b) 13; (c) 78; (d) 91