Fill in the blanks.
Adam spends
13 of his money on 3 marbles and 4 cards.
Each card costs thrice as much as each marble.
Let the price of 1 marble be 1 u.
- Cost of 1 card = _____ 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 marble = 1 u
Cost of 1 card = 3 x 1 u = 3 u
(b)
Amount that Adam has spent
= 3 x 1 u + 4 x 3 u
= 3 u + 12 u
= 15 u
(c)
Fraction of the money he has left
= 1 -
13 =
23 13 of his money = 15 u
23 of his money = 2 x 15 u = 30 u
Amount that Adam has left = 30 u
(d)
Amount that Adam has at first
= 15 u + 30 u
= 45 u
Answer(s): (a) 3; (b) 15; (c) 30; (d) 45