Find two rational numbers between $0.1$ and $0.2$.

In a following equation, what should be maximum value of $R$?

$4P2 + 3Q1 + 2R5 = 1178$

The sum of three consecutive numbers is $126$. Find the highest number-

1. $41$
2. $42$
3. $43$
4. $44$

The population of Patna city is $96000$, the decreasing rate of population is $800$ per year. Population of Patliputra is $68000$, the increasing rate of population is $1200$ per year. In how many years will the population of both places be equal?

If the cost of  $\frac{5}{3}$ parts of a pizza is Rs.$300$, then what will be the cost of $\frac{3}{5}$ parts of the pizza?

The unit digit of the number $6^{256}- 4^{256}$ is: