Surya thought of a number, added 15 to it, then divided the sum by 2 and got 10 as his answer. The number Surya thought of was
A
4
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B
3
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C
1
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D
5
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E
2
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Solution
The correct option is D 5 Let the number Surya thought of = x.
So the equation from the given statement = (x+15)2=10 ⇒(x+15)=10×2 ⇒(x+15)=20 ⇒x=20−15 ⇒x=5
So the number that he thought of was 5.