How many glasses of water is required to fill one litre of water bottle, if one glass of water is $25 \mathrm{mL}$.

Arrange the following fractions in ascending order.

$\frac{2}{5}, \frac{3}{5}, \frac{4}{5}, \frac{5}{5}, \frac{6}{5}$

Arrange the following fractions in descending order.

$\frac{5}{2}, \frac{5}{3}, \frac{5}{4}, \frac{5}{5}, \frac{5}{6}$

By how much is the difference of $18.89$ and $11.21$ less than their sum.

What should be added to $6.77$ to get $7$?

What should be added to the difference of $6.88$ and $4.25$ to get $5$?

Arrange the following fractions in ascending order and descending order.

$\frac{15}{32}, \frac{13}{16}, \frac{9}{4}, \frac{11}{8}$

Arrange the following fractions in ascending order and descending order.

$\frac{4}{3}, \frac{3}{5}, \frac{3}{2}, \frac{5}{6}$

Joshna and Vijay have some chocolates. The number of chocolates with Joshna is two-third of the number of chocolates with Vijay. If Vijay gives five chocolates to Joshna, then both will have equal number of chocolates. How many chocolates does Joshna have?