Question

Rashi ordered pizza and coke for her friends. The bill appeared like this where two digits now represented by A and B, were not visible clearly.

$\begin{array}{ccc}A& 1& 2\\ +3& 1& B\\ 5& 2& 5\end{array}$

So she decided to find the two digits A and B. What would be the values of A and B?

Answer 1

Starting from the units's place, we have 2 + B = 5. Hence, B = 5 - 2 = 3 (there is no carry over to the tens place from units place)

Consider digits in the tens place.
1 + 1 = 2 (there is no carry over to hundreds place from tens place)

In the hundreds place, we have A + 3 = 5. Hence, A = 5 - 3 = 2.

$\begin{array}{ccc}2& 1& 2\\ +3& 1& 3\\ 5& 2& 5\end{array}$

Therefore, A = 2 and B = 3.