A winery has a vat with two pipes leading to it. The inlet pipe can fill the vat in 7 hours, while the outlet pipe can empty it in 10 hours. How long will it take to fill the
vat if both pipes are left open?

could you reply to this with the question so i can ?

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2