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Instructions

In each of these question, you are given two statements. To answer these questions, you can use oneor both the statements. Give your answer as

Question 38

What is the value of the 2-digit number ab?
A. The difference between its digits is 4.
B. The sum of its digits is 4.

Solution

Let the digits of the number be $$x$$ and $$y$$

Clearly, each statement alone is not sufficient as there can be many possibilities. By combining the above statements, we get :

=> $$x+y=4$$ and $$x-y=4$$

By solving above equations, we get : $$x=4$$ and $$y=0$$, thus number = 40

$$\therefore$$ Both statements together are sufficient.

=> Ans - (C)

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