Question

Paint is mixed 3 parts blue to 1 part white in order to lighten it.  Sam needs 12 litres of paint. How much blue and white paint will be needed?

He will need ?? litres of blue paint.

He will need ?? litres of white paint.

Answer 1

12 litres of blue paint will be 4 liters of white paint. Hope I helped

Answer 2

Sam will need 9 liters of blue paint.

and 3 liters of white paint.

Explanation:

Paint is mixed 3 parts blue to 1 part white.

i.e. if 3x liters of blue paint is taken than x liters of white paint is needed.

Sam needs 12 liters of paint.

i.e. 3x+x=12

⇒ 4x=12

Dividing both sides by 4,we get

x=3

Blue paint=3x=3×3=9 liters

White paint=x=3 liters

Hence, Sam will need 9 liters of blue paint.

and 3 liters of white paint.