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Question

Rahul was asked to think of a natural number. He was asked to multiply its square by 5 then add 8 and then subtract half of the original number. He wrote 503.What was the number he thought of?


A

9

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B

-9.9

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C

10

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D

-10

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Solution

The correct option is C

10


Let the required number be x

Square of x=x2

Hence the equation formed =5x2+8x2

5x2+8x2 =503

We get x=10 or x=9.9

Since - 9.9 is not a natural number, the number he thought of is 10.


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