The sum of a number and its reciprocal is equal to 1/10 multiple of the number of playing card in

M4maths Previous Puzzles

26 Feb 2010 x ?

The sum of a number and its reciprocal is equal to 1/10 multiple of the number of playing card in a deck.
x is?

OPtion

1) 10
2) 6
3) 3
4) 4
5) 5
6) 8
7) 9
8) 7
9) 11
10) 12

Solution

According to the given condition
x + (1/x) = 52/10
or x + (1/x) = 26/5
On solving, we get x = 5, 1/5

Correct Option: 5 Best Solution (5)