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Question

There is a certain number, whose value is unknown. But it is known that when 5 is added to that number, we get 15. What is the value of the number?

A
12
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B
11
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C
9
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D
10
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Solution

The correct option is D 10
Let the unknown number be x.
Now, when we add 5 to that number, the expression becomes x+5.
Given, when 5 is added to that number, we get 15.
Hence, x+5=15.
Subtracting 5 from both sides of the equation, we get
x+55=155.
x=10
Hence, the unknown number is 10.

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