Math
posted by Yesenia .
The ratio of the weight of Philipe's gerbil to the weight of Dana's gerbil is 4:7. When both gerbils are placed on a scale, the scale reads 99 ounces. how much does Dana's gerbil weigh?

so, divide the 99 by (4+7), or that equals 9
4*9=36
7*9=?