How long was each sprinkler used?

Question

the wood family and the barnes family each used their sprinklers last summer. the water output rate for the wood family's sprinkler was 35L per hour. the water output rate for the barnes family's sprinkler was 30L per hour. the families used their sprinklers for a combined total of 70 hours, resulting in a total water output of 2300L. how long was each sprinkler used?

Woods family sprinkler hours:

barnes family sprinkler hours:

Answer 1

Let W = # hrs for Wood

Let B = # hrs fpr Barnes

W + B = 70

35W + 30B = 2300

Multiply the first equation by 30 and subtract it from the 2nd equation to get 5W=200

You take it from here!