Sally can paint a room in 7 hours. Steve can paint the same room in 4 hours. How long will it take to paint the room[..]

If a 54 ft rope is cut into two sections with one section 8 times as long as the other section, how long is the[..]

a bus took a 225 mile trip in 6 hours. the speed was 40 mph for the first part of the trip, and 25 mph for the[..]

if i agree to pay 20% of a tv and wendy agrees to pay 80%, and i pay 99 dollars how much does wendy pay?

A human hair is 4 X 10 ^-5m in diameter. A stand of DNA is 2 nanometers in diameter. How many strands of DNA laid[..]

Nico is saving money for his college education. He invests some money at 8% and $1200 less than that amount at 7%.[..]

Ana bought two melons and one pineapple for $8.96. If she had purchased one melon and two pineapples, she would have[..]

Nico is saving money for his college education. He invests some money at 8% and %1200 less than that amount at 7%.[..]

how many gallons of 40% antifreeze should be mixed with 10 gallons of 85%antifreeze to obtain a 65% antifreeze mixture?

How much pure acid should be mixed with 2 gallons of an 80% acid solution in order to get a 90% acid solution?