Adam buys a bead for $6.
He also buys a marble.
The marble costs 4 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 2 beads?
(a)
Choose the cheaper item to be 1 u.
The marble costs 4 times as much as the bead.
The bead is cheaper.
Cost of the bead = 1 u = $6
Cost of the marble = 4 u
Amount that the bead costs less than the marble
= 4 u - 1 u
= 3 u
= 3 x 6
= $18
(b)
Total amount that Adam spends
= 1 u + 4 u
= 5 u
= 5 x 6
= $30
(c)
Cost of 5 marbles
= 5 x 4 u
= 20 u
= 20 x 6
= $120
(d )
Cost of 3 marbles and 2 beads
= 3 x 4 u + 2 x 1 u
= 12 u + 2 u
= 14 u
= 14 x 6
= $84
Answer(s): (a) $18; (b) $30; (c) $120; (d) $84