Question

Three girls bought a pizza for lunch. One girl ate 1/3 of the pizza another girl ate 1/4 of the pizza and the third ate the rest of the pizza. How much of the pizza did the third girl eat?

Answer 1

One ate  1/3,  Another ate = 1/4.

Total ate =  1/3 + 1/4  = (4 + 3) / 12 = 7/12

Fraction the third girl got =  (The whole =1)  minus 7/12

=  1 - 7/12 =  (12 - 7) / 12 = 5/12

The third girl ate 5/12 of the pizza.