The temperature dropped $15$ degree Celsius in the last 30 days. If the rate of temperature drop remains the same, how many degrees will the temperature drop in the next ten days.

If the $\mathrm{k}°$ temperature drop in next ten days, then find the value of $\mathrm{k}$?

Shaina pays $₹ 15000$ as rent for $3$ months. How much does she has to pay for a whole year, if the rent per month remains same.

If the per month rent is $₹\mathrm{k}$, then find the value of $\mathrm{k}$.(Write the answer in the box without commas)

The weight of $72$ books is $9 \mathrm{k}\mathrm{g}.$ What is the weight of $40$ such books$?$

If the required answer is of the form $\mathrm{p} \mathrm{kg}$, then what is the value of $\mathrm{p}$$?$