Pema Dorji(boy) and Kezang Choden(girl) are two children in a family. Pema Dorji has thrice as many sisters as he has brothers. Kezang Choden has two less brothers than she has sisters. How many children are there in the family?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.