The weight of $52$ books is $12\mathrm{kg}$.Find how many books of the same kind can be weighed for $27\mathrm{kg}$.

$5$ water tanks can be filled by $12$ pipes in $4$ hours. How many tanks can be filled by the same number of pipes in $10$ hours?

Bob has completed $48\%$ of his assignment at the same time Tom has completed $\frac{2}{3}$ of his assignment. Who among them is lagging behind?

By what number must the given number be multiplied to increase the number by $20\%$?

Vaibhav did not go to school for $36$ days in a year. If his absence from school is $15\%$. Find the number of days the school opened.

Sanju's salary has been increased by $14\%$ this year. Last year he got $₹42500$ per month. What is his salary per month this year?

Amrutha put $₹580$ into a saving account for three years. The rate of increase on the account is $9\frac{1}{2}\%$. How much was the interest for the year?

A bakery had cupcakes of two flavours-vanilla and chocolate. $40$ were chocolate cupcakes and $60\%$ of the cupcakes are flavoured vanilla. Find the number of vanilla cupcakes. Also, find how much percent more are flavoured vanilla than chocolate.