Adam buys a bead for $2.
He also buys a marble.
The marble costs 2 times as much as the bead.
- How much less does the marble cost than the bead?
- How much does he spend altogether?
- How much are 5 marbles?
- How much are 3 marbles and 5 beads?
(a)
Choose the cheaper item to be 1 u.
The marble costs 2 times as much as the bead.
The bead is cheaper.
Cost of the bead = 1 u = $2
Cost of the marble = 2 u
Amount that the bead costs less than the marble
= 2 u - 1 u
= 1 u
= 1 x 2
= $2
(b)
Total amount that Adam spends
= 1 u + 2 u
= 3 u
= 3 x 2
= $6
(c)
Cost of 5 marbles
= 5 x 2 u
= 10 u
= 10 x 2
= $20
(d )
Cost of 3 marbles and 5 beads
= 3 x 2 u + 5 x 1 u
= 6 u + 5 u
= 11 u
= 11 x 2
= $22
Answer(s): (a) $2; (b) $6; (c) $20; (d) $22