Question

what should be added to 3÷4 so that the sum is 4÷3

Answer 1

what should be addded so that the sum is 4÷3  = ADD 7÷12

Explaination :  3/4 + X = 4/3

X = 7/12

Answer 2

To get what should be added, subtract the number(which is 3÷4) from the sum( which is 4÷3).

$\frac{4}{3} - \frac{3}{4}= \frac{16-9}{12} =\boxed{ \frac{7}{12} }$