Question

A tank is one-third full of oil.after taking out 7 litres from it,it is now only one-fourth full. How much oil does the tank hold?
Please provide how you solved the problem
thanks

Answer 1

If the full tank holds x liters, they have told you that

x/3 - 7 = x/4

Now just solve for x.

Answer 2

x/3-7=x/4
Get the lcd which is 12.
12*x/3-12*7=12*x/4
4x-84=3x
you take 3x to the other side of the opposite side and the sign changes to -3x
4x-3x=x
x=84

Answer 3

x/3-7=x/4
Get the lcd which is 12.
12*x/3-12*7=12*x/4
4x-84=3x
you take 3x to the other side of the opposite side and the sign changes to -3x
4x/12-3x12=x/12=84
x/12=84
12=84x12=1008 litres