Two brands of paint (Durable and Forever) are each sold by the gallon in three diffrent grades: good, better and best quality. The sales manager at a hardware store tracks all te paint sales. She started making a table but did not finish it
The experimental probability that the next galon of paint sold will be better-qaulity durable paint is 9/50.How can we find out how many gallons of "good quality/forever" paint were sold? Explain in words, then, show your mathematical work to arrive at your answer.