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+5−5=15−5. ∴x=10 Hence, the unknown number is 10.