David has $13. Ben has $4
r more than David. Ryan has $2
r less than Ben.
- Find the amount of money that Ryan has in terms of r.
- Find the total amount of money that the three boys have in terms of r.
- If r = 7, how much does Ryan have?
(a)
Amount that David has = $13
Amount that Ben has = $(13 + 4
r)
Amount that Ryan has
= 13 + 4
r - 2
r = $(13 + 2
r)
(b)
Total amount that the three boys have
= 13 + 13 + 4
r + 13 + 2
r= 13 + 13 + 13 + 4
r + 2
r = $(39 + 6
r)
(c)
Amount that Ryan has
= 13 + 2
r= 13 + 2 x 7
= 13 + 14
= $27
Answer(s): (a) $(13 + 2
r) or $(2
r + 13); (b) $(39 + 6
r) or $(6
r + 39); (c) $27