A jar full of whisky contains $40\%$ of alcohol. A part of this whisky is replaced by another containing $19\%$ alcohol and now the percentage of alcohol was found to be $26$. The quantity of whisky replaced is : $\frac{2}{5}$ $\frac{1}{3}$ $\frac{2}{3}$ $\frac{3}{5}$

In a swimming-pool $90$ m by $40$ m, $150$ men take a dip. If the average displacement of water by a man is $8$ cubic metres, what will be rise in water level ? $30$ cm $33.33$ cm $20.33$ cm $25$ cm

A conical tent is to accommodate $10$ persons. Each person must have $6$ $m$^{2}$ space to sit and $30$ $m$^{2}$ of air to breath. What will be height of cone ? $37.5$ $m$ $150$ $m$ $75$ $m$ $15$ $m$

A school has $378$ girls and $675$ boys. All the students divided into strictly boys and strictly girls students sections. All the sections in the school has same number of students. What is the number of sections in the school? $27$ $36$ $39$ $23$