Water flows from a container at a rate of 2.5 litres per minute . the water flows into a tank that already holds 50 litres. how long in seconds is it before there are 765 litres in the tank. pls answer it with workings out.

Y = 2.5x + 50with y being the total liters in the tank and x being the number of seconds

when total liters is 765so sub in 765 for y and solve for x
765 = 2.5x + 50
765 - 50 = 2.5x
715 = 2.5x
715 / 2.5 = x
286 = x < so it would take 286 seconds 

Did u want to find the value of x?