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?
10
Let the required number be x
Square of x=x2
Hence the equation formed =5x2+8−x2
⇒5x2+8−x2 =503
We get x=10 or x=−9.9
Since - 9.9 is not a natural number, the number he thought of is 10.