abc and def are 3-digit numbers such that
and none of a, b, c, d, e, or f is 0. What is the sum a + b + c + d + e + f ?
Here, $$c+f=10$$ and $$b+e=9$$ and $$a+d=9$$ [because of carry over 1]
Adding all the equations, => $$a+b+c+d+e+f=10+9+9=28$$
=> Ans - (D)