Answer to question 3:
n denotes the number of pizzas.
The cost of one pizza is $6.
The total amount spent was $30.
We need to find out how many pizzas were purchased.
The equation that represents the total cost of buying is:
6n = 30
⇒ n = 30/6 = 5
Therefore the number of pizzas purchased is 5.
Answer to question 4:
n denotes the number of pizzas.
The cost of one pizza is $6.
The delivery fee is $10.
The total amount spent was $70.
We need to find out how many pizzas were purchased.
The equation that represents the total cost of buying is:
6n + 10 = 70
⇒ 6n = 70 - 10
⇒ 6n = 60
⇒ n = 10
Therefore the number of pizzas purchased is 10.
Answer to question 5:
n denotes the number of pizzas.
The cost of one pizza is $6.
The delivery fee is $10.
The total amount given to the driver is $50.
We need to find out the tip amount given to the driver when 5 pizzas are purchased.
Let y denote the tip amount.
The equation that represents the total cost of buying is:
6*5 + 10 + y = 50
⇒ 30 + 10 + y = 50
⇒ y = 50 - 40
⇒ y = 10
Therefore the tip amount given to the driver is $10.
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