Fill in the blanks.
Alan spends
17 of his money on 3 cards and 4 erasers.
Each eraser costs thrice as much as each card.
Let the price of 1 card be 1 u.
- Cost of 1 eraser = _____ u
- Amount that Alan has spent = _____ u
- Amount that Alan has left = _____ u
- Amount that Alan has at first = _____ u
(a)
Change X times into units.
Cost of 1 card = 1 u
Cost of 1 eraser = 3 x 1 u = 3 u
(b)
Amount that Alan 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 -
17 =
67 17 of his money = 15 u
67 of his money = 6 x 15 u = 90 u
Amount that Alan has left = 90 u
(d)
Amount that Alan has at first
= 15 u + 90 u
= 105 u
Answer(s): (a) 3; (b) 15; (c) 90; (d) 105