if 20% of A = 50% of B, then what percentage of A is B?

If $$x+{1\over x}=c{1\over c}$$ then the value of x

Directions : Study the following pie chart carefully and answer the questions. The pie chart represents the percentage of people involved in various occupations.
Total number of people = 20000

The difference between the maximum number of people involved and minimum number of people involved in various professions is 

Answer the following questions

Lokesh sold two items at same price. One of them was sold at a profit of 10% and the other at the loss of 10%. What is the net result of entire transaction?

The HCF of two numbers 12906 and 14818 is 478. Their LCM is

A tradesman marks his goods at such a price that after allowing a discount of 15%, he makes a profit of 20%. What is the marked price of an article whose cost price is ₹ 170? 

A and B together can complete a certain work in 20 days whereas B and C together can complete it in 24 days. If A is twice as good a work man as C, then in what time will B alone do 40% of the same work? 

Find the average of 1.11, 0.01, 0.101, 0.001, 0.11