Fill in the blanks.
Alex spends
16 of his money on 4 erasers and 4 buttons.
Each button costs thrice as much as each eraser.
Let the price of 1 eraser be 1 u.
- Cost of 1 button = _____ u
- Amount that Alex has spent = _____ u
- Amount that Alex has left = _____ u
- Amount that Alex has at first = _____ u
(a)
Change X times into units.
Cost of 1 eraser = 1 u
Cost of 1 button = 3 x 1 u = 3 u
(b)
Amount that Alex has spent
= 4 x 1 u + 4 x 3 u
= 4 u + 12 u
= 16 u
(c)
Fraction of the money he has left
= 1 -
16 =
56 16 of his money = 16 u
56 of his money = 5 x 16 u = 80 u
Amount that Alex has left = 80 u
(d)
Amount that Alex has at first
= 16 u + 80 u
= 96 u
Answer(s): (a) 3; (b) 16; (c) 80; (d) 96