Question

Find A in the addition, when B=1

$$\begin{array}{c}A\\ +A\\ +A\\ BA\end{array}$$

• A. 1
• B. 5
• C. 3
• D. 2

Answer 1

The correct option is B

5

BA can be written as 10B +A, as B is in the tens digit and A in the ones digit.

$3A=10\times B+A$
$\Rightarrow 2A=10\times B$
$\Rightarrow B=\frac{A}{5}$
The above solution satisfies this relation.

as B=1, A will be equal to 5

$$\begin{array}{c}5\\ +5\\ +5\\ 15\end{array}$$

That is, A= 5 and B= 1