Adam buys a marble for $2.
He also buys a bead.
The bead costs 2 times as much as the marble.
- How much less does the bead cost than the marble?
- How much does he spend altogether?
- How much are 5 beads?
- How much are 3 beads and 2 marbles?
(a)
Choose the cheaper item to be 1 u.
The bead costs 2 times as much as the marble.
The marble is cheaper.
Cost of the marble = 1 u = $2
Cost of the bead = 2 u
Amount that the marble costs less than the bead
= 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 beads
= 5 x 2 u
= 10 u
= 10 x 2
= $20
(d )
Cost of 3 beads and 2 marbles
= 3 x 2 u + 2 x 1 u
= 6 u + 2 u
= 8 u
= 8 x 2
= $16
Answer(s): (a) $2; (b) $6; (c) $20; (d) $16