Fill in the blanks.
Amadeus spends
13 of his money on 4 pens and 5 cards.
Each card costs thrice as much as each pen.
Let the price of 1 pen be 1 u.
- Cost of 1 card = _____ 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 card = 3 x 1 u = 3 u
(b)
Amount that Amadeus has spent
= 4 x 1 u + 5 x 3 u
= 4 u + 15 u
= 19 u
(c)
Fraction of the money he has left
= 1 -
13 =
23 13 of his money = 19 u
23 of his money = 2 x 19 u = 38 u
Amount that Amadeus has left = 38 u
(d)
Amount that Amadeus has at first
= 19 u + 38 u
= 57 u
Answer(s): (a) 3; (b) 19; (c) 38; (d) 57