Abookkeeper needs to post the cost of a desk and chair into his records. the cost of the desk was five times the cost of the chair. the total cost of both the desk and chair was $720. what was the cost of the desk?

The cost of the desk is: $ 600

Let the cost of desk=$ x

and the cost of chair= $ 5x

( Since, it was given that:The cost of the desk was five times the cost of the chair )

Also, the total cost of the both the items is: $ 720

This means that:

On dividing both side by 6 we obtain:

Hence, we get:

Cost of chair=$ 120

and cost of Desk= 5×120=$ 600

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)

the two may have that, even a breakdown is probably offered