Question

a large cheese pizza costs $7.50. Each additional topping for the pizza costs $1.35. if the total bill for the pizza sally ordered was $12.90, how many toppings did she order? and write an equation to model the situation, then solve.

Answer 1

Data:

Pt (pizza+topping) = $7.50
t (topping) = $1.35
tt (total) = $12.90
nt (number topping) = ?

Solving:


`pt + t*nt = tt (equation)`


`7.50 + 1.35nt = 12.90`

`1.35nt = 12.90 - 7.50`

`1.35nt = 5.4`

`nt = (5.4)/(1.35)`

`\boxed{nt = 4}`

For better understanding

Data:

A (pizza+topping) = $7.50
B (topping) = $1.35
C (total) = $12.90
D (number topping) = ?

Solving:


`A + B*C = D (equation)`


`7.50 + 1.35D = 12.90`

`1.35D = 12.90 - 7.50`

`1.35D = 5.4`

`D = (5.4)/(1.35)`

`\boxed{D = 4}`