Fill in the blanks.
Alfie spends
12 of his money on 4 marbles and 4 beads.
Each bead costs four times as much as each marble.
Let the price of 1 marble be 1 u.
- Cost of 1 bead = _____ u
- Amount that Alfie has spent = _____ u
- Amount that Alfie has left = _____ u
- Amount that Alfie has at first = _____ u
(a)
Change X times into units.
Cost of 1 marble = 1 u
Cost of 1 bead = 4 x 1 u = 4 u
(b)
Amount that Alfie has spent
= 4 x 1 u + 4 x 4 u
= 4 u + 16 u
= 20 u
(c)
Fraction of the money he has left
= 1 -
12 =
12 12 of his money = 20 u
12 of his money = 1 x 20 u = 20 u
Amount that Alfie has left = 20 u
(d)
Amount that Alfie has at first
= 20 u + 20 u
= 40 u
Answer(s): (a) 4; (b) 20; (c) 20; (d) 40