The Brooks family and the Kim family both used their sprinklers last summer. The water output rate for the Brooks family sprinkler was 40 L per hour. The water output rate for the Kim family sprinkler was 30 L per hour. The families used their sprinklers for a combined total of 55 hours, resulting in a total output of 1900 L. How long was the sprinkler used.

Step-by-step explanation:

Let B be the time the Brooks sprinklers were on, and K be that of the Kims'. Then:

B + K=55

40B + 30K=1900

Solve for B and K

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9

45

step-by-step explanation: