A sum of money becomes triple itself in 16 years. In how many years will it become 5 times at the same rate?

If 80 litres of milk solution has 60% milk in it, then how much milk should be added to make milk 80% in the solution?

In the following questions two equations numbered I and II are given. You have to solve both the equations and ____
I.$$\sqrt { 361} x+\sqrt { 16}=0 \ $$
II.$$\sqrt { 441} y+\ { 4}=0 \ $$
Give answer
(A) x> y
(B) x ≥ y
(C) x< y
(D) x ≤ y
(E) x=y or the relationship cannot be established

What approximate values should come in place of the question mark(?) in the following question?

In what time will the simple interest be 2/5 of the principal at 8 percent per annum? 

If 10 men or 20 women or 40 children can do a piece of work in 7 days, then 5 men, 5 women and 5 children together can do half of the work in 

In an office, there are 108 tables and 132 chairs. If $${1\over6} $$ of the tables and $${1\over4} $$ of the chairs are broken. How many people can work in the office if each person requires one table and one chair? 

In an exhibition entrance charge was Rs.5 and now it is reduced by 20%. Therefore total income on selling the tickets is increased by 44%, then what is the percent increase in tickets sold?