If $40 \%$ of a number is $360,$ what will be $15 \%$ of that number?

$A$ piece of cloth measured with a metre stick,which is $1 \ cm$ short,is found to be $100 \ m$ long. Reckoning the metre stick as being correct,what is the actual length of the cloth in $cm$?

Divide $50$ into two parts so that the sum of their reciprocals is $1/12$.

$A$ number when divided by $361$ gives a remainder $47$. If the same number is divided by $19$,the remainder obtained is

$65 \%$ of $240 + ? \%$ of $150 = 210$

$A$ boy added all natural numbers from $1$ to $12,$ however he added one number twice due to which the sum became $80.$ What is the number which he added twice?