In a class test containing $15$ questions, $4$ marks are given for every correct answer and $\left(-2\right)$ marks are given for every incorrect answer.
(i) Gurpreet attempts all questions but only $9$ of her answers are correct. What is her total score? (ii) One of her friends gets only $5$ answers correct. What will be her score?

A shopkeeper earns a profit of $₹ 1$ by selling one pen and incurs a loss of $40$ paise per pencil while selling pencils of her old stock.

(i) In a particular month she incurs a loss of $₹ 5$. In this period, she sold $45$ pens. How many pencils did she sell in this period?

(ii) In the next month she earns neither profit nor loss. If she sold $70$ pens, how many pencils did she sell?

In a class of $40$ students $\frac{1}{5}$ of the total number of students like to study English, $\frac{2}{5}$of the total number of students like to study Mathematics and the remaining like to study Science.

(i) How many students like to study English?

(ii) How many students like to study Mathematics?

(iii) What fraction of the total number of students like to study Science?