Question

in a biology class 1/4 of the class studied frogs and 2/3 of the class studied snakes.the rest of the class studied birds.what fractionof the class studied birds

Answer 1

No. Of students who studied frogs=1/4
No. Of students who studied snakes=2/3.
Let total no. Of students in class=x
So no. Of students who studied birds=x-(Students who studied frogs +students who studied snakes)=x-(x/4+2x/3)
=x-(3x+8x)÷12
=x-11x/12
=(12x-11x)÷12
=x/12
So 1/12 of the class studied birds.
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