One coin costs $
b. One notebook costs $(
b + 15). One colouring book costs $4
b.
- Ben bought 2 coins, 3 notebooks and 1 colouring book. How much did he spend? Simplify your answer in terms of b.
- If b = 13, how much did Ben spend altogether?
(a)
Cost of 2 coins = 2 x
b = $2
b Cost of 3 notebooks = 3 x (
b + 15) = $(3
b + 45)
Cost of 1 colouring book = $4
b Total amount that he spent
= 2
b + 3
b + 45 + 4
b= 2
b + 3
b + 4
b + 45
= $(9
b + 45)
(b)
If
b = 13,
total amount that he spent
= 9
b + 45
= (9 x 13) + 45
= 117 + 45
= $162
Answer(s): (a) $(9
b + 45) or $(45 + 9
b); (b) $162