A winery has a vault with two pipes leading to it. The inlet pipe can fill the vat in 7 hours, while the outlet pipe can empty it in 9 hours. How long will it take to fill the vat if both pipes are left open?

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5

step-by-step explanation:

answers available in this download

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its adding 5.5 each time

step-by-step explanation: