One marble costs $
c. One marker costs $(
c + 15). One story book costs $3
c.
- David bought 4 marbles, 3 markers and 1 story book. How much did he spend? Simplify your answer in terms of c.
- If c = 18, how much did David spend altogether?
(a)
Cost of 4 marbles = 4 x
c = $4
c Cost of 3 markers = 3 x (
c + 15) = $(3
c + 45)
Cost of 1 story book = $3
c Total amount that he spent
= 4
c + 3
c + 45 + 3
c= 4
c + 3
c + 3
c + 45
= $(10
c + 45)
(b)
If
c = 18,
total amount that he spent
= 10
c + 45
= (10 x 18) + 45
= 180 + 45
= $225
Answer(s): (a) $(10
c + 45) or $(45 + 10
c); (b) $225