Tamil Nadu Board Solutions for Chapter: Direct And Inverse Proportion, Exercise 5: Exercise 4.1

The shadow of a pole with the height of $8 \mathrm{m}$ is $6 \mathrm{m}$. If the shadow of another pole measured at the same time is $30 \mathrm{m}$, find the height of the pole? Express the answer in $\mathrm{m}$.

A postman can sort out $738$ letters in $6$ hours. How many letters can be sorted in $9$ hours?

If half a meter of cloth costs $₹15$, then find the cost of  $8\frac{1}{3}$ meters of the same cloth. Express your answer in $₹$.

The weight of $72$ books is $9 \mathrm{kg}$. What is the weight of $40$ such books? (using unitary method). Express your answer in $\mathrm{kg}$.

Thamarai pays $₹7500$ as rent for $3$ months. With the same rate how much does she have to pay for $1$ year? (using unitary method). Express your answer in $₹$.

If $30$ men can reap a field in $15$ days, then in how many days can $20$ men reap the same field? (use unitary method).

Valli purchases $10$ pens for $₹180$ and Kamala buys $8$ pens for $₹96$. Can you say who bought the pen cheaper? (use unitary method). Mention the name of person as your answer.

A motorbike requires $2$ litres of petrol to cover $100$ kilometers. How many litres of petrol will be required to cover $250$ kilometers? (use unitary method). Express your answer in litres.