W3 11 o c equ ans: 1. 1Weterl'llllastewater Treatment The height of the tank is 1.4 tintes its width. 2. General Trade: The sum of the two weights is 16? lb. 3. General Trade: The volume of a cylinder is equal to it of its height times 1r times the square of its diameter. 4. General Trade: The weight in kilograms is equal to 0.454 times the weight in pounds. 5. Machine Trades The volume of a solid bar is equal to the product of the cross-sectional area and the length of the bar. Set up equations and solve. l. WaterMastevvater Treatment Two tanks must have a total capacity of 400 gallons. lfone tank needs to be twice the size of the other. how many gallons should each tank hold? 2. Machine Trades T'wo metal castings weigh a total of 84 lb. One weighs 12 lb more than the other. How much does each one weigh? 3. Plumbing The plumber wants to cut a 24-h length of pipe into three sec tions. The largest piece should be twice the length of the middle piece. and the middle piece should be twice the length of the smallest piece. How long should each piece be? 4- Electrical Trades For customers primarily using their own solar pcwer. a certain electric utility charges an $13 per month maintenance fee but refunds to the customer $0.06 per kilowatt-hour of net electricin that is returned to the grid. Following the method of Example 5. set up an equa- tion and solve for the amount of electricity a customer would need to return to the grid in order to break even