What is √4+(√4-(√4+....)

A milkman claims to sell milk at cost price only.Still he is making a profit of 20% since he has mixed some amount of water in the milk.What is the percentage of milk in the mixture?

What is the sum of digits of the least multiple of 13,which when divided by 6,8 and 12 leaves remainder 5.7 and 11 respectively as remainders?

The number of values satisfying (x+100/x)>50,where is  a natural number less than or equal to 100 is