$69.69 - 51.54 + 73.64 = ? + 32.42$

The sum of squares of two numbers is $68$ and the square of their difference is $36$. The product of the two numbers is

The sum of a non-$zero$ number and twice its reciprocal is $\frac{33}{4}$. Find the number.

$\sqrt{6+\sqrt{6+\sqrt{6+\cdots}}} = ?$

$A$ boy added all natural numbers from $1$ to $12,$ however he added one number twice due to which the sum became $80.$ What is the number which he added twice?

$A$ fraction is greater than its reciprocal by $\frac{9}{20}$. What is the fraction?