a student gets 70 % in one subject , 80 % in the other . to get an overall of 75 % how much should get in third subject .
"a student gets 70 % in one subject , 80 % in the other . average of 2 subjects is 75 % , if they have equal weightage . to get an overall of 75 % , he should get 75 % in third subject to maintain same % age . . if they have equal weightage . answer : a"
subtract(multiply(75, const_3), add(70, 80))