Question

Brian is a window cleaner. He uses the following formula to calculate the amount to charge his customers:

Charge = £20 + 4n

Where n is the number of windows a house has.



If a house has 7 windows, how much would Brian charge?​

Answer 1

£48

Explanation:

To calculate the amount Brian would charge for a house with 7 windows, we can substitute the value of n into the formula:

Charge = £20 + 4n

Given that n = 7, we can substitute it into the formula:

Charge = £20 + 4(7)

Calculating the multiplication first:

Charge = £20 + 28

Adding the values together:

Charge = £48

Therefore, Brian would charge £48 for a house with 7 windows.