Fill in the blanks.
Amadeus spends
15 of his money on 4 cards and 5 buttons.
Each button costs twice as much as each card.
Let the price of 1 card be 1 u.
- Cost of 1 button = _____ 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 card = 1 u
Cost of 1 button = 2 x 1 u = 2 u
(b)
Amount that Amadeus 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 -
15 =
45 15 of his money = 14 u
45 of his money = 4 x 14 u = 56 u
Amount that Amadeus has left = 56 u
(d)
Amount that Amadeus has at first
= 14 u + 56 u
= 70 u
Answer(s): (a) 2; (b) 14; (c) 56; (d) 70