Thread: finding cost

Sara wants to paint her home. She can buy three cans of the same-priced paint and three identical brushes for $21, or she can buy four cans of the same paint and one brush for $22. How much does a can of paint cost?
Which one option is true :

A.

$2

B.

$3

C.

$4

D.

$5

E.

$6

Originally Posted by mths

Sara wants to paint her home. She can buy three cans of the same-priced paint and three identical brushes for $21, or she can buy four cans of the same paint and one brush for $22. How much does a can of paint cost?
Which one option is true :

A.

$2

B.

$3

C.

$4

D.

$5

E.

$6

Let x denote the price of one can of paint and y the price of one brush.

Then you can set up a system of simultaneous equations:



Now solve for x. I've got x = 5, so it's answer D.