Fill in the blanks.
Adam spends
17 of his money on 3 cards and 2 pencils.
Each pencil costs twice as much as each card.
Let the price of 1 card be 1 u.
- Cost of 1 pencil = _____ u
- Amount that Adam has spent = _____ u
- Amount that Adam has left = _____ u
- Amount that Adam has at first = _____ u
(a)
Change X times into units.
Cost of 1 card = 1 u
Cost of 1 pencil = 2 x 1 u = 2 u
(b)
Amount that Adam has spent
= 3 x 1 u + 2 x 2 u
= 3 u + 4 u
= 7 u
(c)
Fraction of the money he has left
= 1 -
17 =
67 17 of his money = 7 u
67 of his money = 6 x 7 u = 42 u
Amount that Adam has left = 42 u
(d)
Amount that Adam has at first
= 7 u + 42 u
= 49 u
Answer(s): (a) 2; (b) 7; (c) 42; (d) 49