Diane has four shirts for every eight pairs of jeans that she owns. If she owns 16 pairs of jeans, then how many shirts does she own?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?