One card costs $
f. One pencil costs $(
f + 15). One colouring book costs $5
f.
- Liam bought 7 cards, 3 pencils and 1 colouring book. How much did he spend? Simplify your answer in terms of f.
- If f = 5, how much did Liam spend altogether?
(a)
Cost of 7 cards = 7 x
f = $7
f Cost of 3 pencils = 3 x (
f + 15) = $(3
f + 45)
Cost of 1 colouring book = $5
f Total amount that he spent
= 7
f + 3
f + 45 + 5
f= 7
f + 3
f + 5
f + 45
= $(15
f + 45)
(b)
If
f = 5,
total amount that he spent
= 15
f + 45
= (15 x 5) + 45
= 75 + 45
= $120
Answer(s): (a) $(15
f + 45) or $(45 + 15
f); (b) $120