while solving such problems we give high precedence to () then * or / and then +,-
So we solve as floor(A) = 0, ceil(B) = 0, floor(C)= 7, ceil(D)=4
also precedence order for +,- is from left to right so numerator value becomes 28 and denominator as 7
28/7.0 = 4 is what i got.
correct me if i am wrong.