Find the value of $$ {^3\sqrt{\sqrt{.000064}}}$$.

Sum of 5 times of a fraction and 4 times its reciprocal is 9. What is fraction?

What approximate value should come in place of the question mark(?) in the following question?
105.003+307.993+ 215.630=?

If $$ 5^{5x+1}=1 $$, then x equals

Which of the following is largest fraction amongst $$ {5\over8}$$, $$ {3\over7}$$, $$ {2\over9}$$,  $$ {4\over5}$$?

If the differernce between the reciprocal of a positive proper fraction and fraction itself be$$17\over42$$, then the fraction is:

Two numbers are in the ratio x : y . If 2 is added to both numerator and denominator ,  the fraction becomes $$ 1\over2$$. Find the value of x + y .