The murphy family and the edwards family each used their sprinklers last summer. the water output rate for the murphy family's sprinkler was 20l per hour. the water output rate for the edwards family's sprinkler was 40l per hour. the families used their sprinklers for a combined total of 65 hours, resulting in a total water output of 2000l . how long was each sprinkler used?

 Time used total: 50 hours.W+C = 50                                 (1) Total water used is 1900 L.Woody family used: 40W; Carter family used 35C.Equation showing how much water both families used:40W + 35 C =1900.                   (2) We have a system with two equations and two variables. We can use substitution method to solve the system. From equation (1) we express W:W=50 - C.                                              (1a) We substitute the variable in equation (2):40(50 - C) +35C =1900. We open the parenthesis2000 -40C +35C =1900, We combine like terms2000 -5C =1900, We subtract 2000 from both sides of the equation-5C = 1900 - 2000, We simplify-5C = -100, We divide by -5C = 20. We substitute the values of C in the equation (1a) and find the value of W:W = 50 - C,W = 50 -20 =30. The Woody family used water for 30 hours and the Carter family used water for 20 hours.We check our work to be sure we did not make any mistakes:Total water used: 40 x 30 + 35 x 20 = 1200 + 700 = 1900 L.

Bobby would have bought 1.21 dollars worth of items from the school store. This because you would line up the problem. In mine, I did 21 on top, 45 in the middle, and 55 on the bottom. And then I added the 1 + 5 + 5 in the right column which equaled 11. This required me to carry the one to the other side and put the other one down in the answer. Then I did 2 + 4 + 5 + 1 = 12. Then you have to add a decimal which makes the most sense to put it in between the 1 and 2. I hope that this is a help and have a great day! If you can please mark this brainliest and contact me if you need more help!