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?

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

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

Three partners invested Rs. 42000, Rs. 48000 and Rs. 32000 respectively. partnership condition is that, each will the get interest on his capital at the rate of 7 % p. a. and the remaining profit will be divided in the ratio of their capitals. If at the end of the year the total profit is Rs. 32940, then find the share of A in profit. 

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?