Ruben and Ofilia are painting the walls of a large lecture hall. They mixed 2 gallons of blue paint with 5 gallons of white paint for a total of 7 gallons of paint. They run out of paint. They estimate that they need 1/2 of a gallon to finish.

Question

Quizplus · Accepted Answer

The Answer is A) The diagram should show the walls (probably one rectangle) marked into 15 equal pieces since 7 gallons equals 14 half-gallons. They have painted 14/15 of the room with the 7 gallons.
B) No. The original rate was 2:5, which is the same as 2/5:1. But if 1 gallon of white paint is used with 1/4 gallon of blue paint, the ratio is 1/4:1, or 1:4, which is not equivalent to 2/5:1.
C) We need a ratio a:b, where a:b is equivalent to 2:5 and where a + b = 1/2. Using 1/4 gallon blue paint and 5/8 gallon of white paint would provide the correct ratio, and the sum is slightly more than 1/2 but close enough for this situation.

Ruben and Ofilia Are Painting the Walls of a Large