Question

in a cake 1/3 of is eaten by anne and 2/4 is eaten by nora what is the portion of the left over cake

Answer 1

1/6 part will be left

Answer 2

I/3 + 2/4 + x = 1 ------------------------ x is the remaining part of the cake
therefore, 4/12 + 6/12 + 12x/12 = 1
by solving the equation, 
10 + 12x = 12
therefore 12x = 12 - 10
                x = 2/12
                x = 1/6
therefore the remaining part of the cake is 1/6