Jenna got 12, or 3/5, of her answers on the test right. how many questions were on the test?

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /