Fill in the blanks.
Abel spends
12 of his money on 5 beads and 2 marbles.
Each marble costs five times as much as each bead.
Let the price of 1 bead be 1 u.
- Cost of 1 marble = _____ u
- Amount that Abel has spent = _____ u
- Amount that Abel has left = _____ u
- Amount that Abel has at first = _____ u
(a)
Change X times into units.
Cost of 1 bead = 1 u
Cost of 1 marble = 5 x 1 u = 5 u
(b)
Amount that Abel has spent
= 5 x 1 u + 2 x 5 u
= 5 u + 10 u
= 15 u
(c)
Fraction of the money he has left
= 1 -
12 =
12 12 of his money = 15 u
12 of his money = 1 x 15 u = 15 u
Amount that Abel has left = 15 u
(d)
Amount that Abel has at first
= 15 u + 15 u
= 30 u
Answer(s): (a) 5; (b) 15; (c) 15; (d) 30