A worker will paint a rectangular wall that is 6 meters long and 4 meters high. One liter of paint can cover 8 square meters of wall. How many liters of paint are needed to finish painting the wall?, A. 2 liters, B. 3 liters, C. 4 liters, D. 5 liters, An electrician must repair a damaged wire in a classroom. The total wire needed is 18 meters. Only 11 meters are available. Before fixing the wire, the main switch must be turned off to prevent accidents. How many more meters of wire are needed and why should the main switch be turned off?D. 5 liters, A. 7 meters; to save electricity, B. 7 meters; to stop electric current, C. 29 meters; to save electricity, D. 11 meters; to stop electric current, A school computer room has an area of 36 square meters. One air-conditioning unit can effectively cool 12 square meters of space. Cooling is important because computers produce heat and high temperature can cause machines to overheat and students to feel uncomfortable. How many air-conditioning units are needed to cool the computer room properly?, A. 2 units, B. 3 units, C. 4 units, D. 6 units, A welder needs to make equal metal bars for a school gate. He has a 15-meter steel rod and will cut it into pieces that are 2.5 meters long each. How many equal metal bars can be made?, A. 5 bars, B. 6 bars, C. 7 bars, D. 8 bars, A motorcycle travels 90 kilometers in 3 hours. The driver must maintain a safe speed to avoid accidents and save fuel. What is the average speed of the motorcycle?, A. 20 km/h, B. 25 km/h, C. 30 km/h, D. 45 km/h.

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