two more questionss!! Algebra?

Question

33. Before the CRT exam is administrated your mathematics quater is 90. What grade do you need on the CRT exam to have a 92 average for the quarter?

34. The selling price for a stereo is 10.28 more than 2 times the wholes sale cost. What is the cost of the stereo?

Answer 1

92 = 90x + y(100-x)
where x is the percent of the grades before the CRT exam and y is the grade on the CRT exam
That equation is all you can do without knowing what percent of the total grade the CRT counts.

S = 10.28 + 2C
again, all you can do is set up the equation