Billy and barbara can mow 1,600 square yards in 81 minutes. how long would it take them to mow 1,600 square feet?

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day