5.52 – 2.3² + 0.8³ × 0.12 ÷ 0.4⁴ – 3.14 =?

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

Sunil has 40 coins of 10 paise and 25 paise each. If he has Rs 7.75, then how many 10 paise coins are there?

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?

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

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

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