Fill in the blanks.
Amadeus spends
18 of his money on 4 pencils and 3 coins.
Each coin costs thrice as much as each pencil.
Let the price of 1 pencil 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 pencil = 1 u
Cost of 1 coin = 3 x 1 u = 3 u
(b)
Amount that Amadeus has spent
= 4 x 1 u + 3 x 3 u
= 4 u + 9 u
= 13 u
(c)
Fraction of the money he has left
= 1 -
18 =
78 18 of his money = 13 u
78 of his money = 7 x 13 u = 91 u
Amount that Amadeus has left = 91 u
(d)
Amount that Amadeus has at first
= 13 u + 91 u
= 104 u
Answer(s): (a) 3; (b) 13; (c) 91; (d) 104