JBC Expert Team Solutions for Chapter: Practice Set, Exercise 15: Quantitative Aptitude

The number that should be added to both the numerator and denominator of  $\frac{4^2}{9^2}$,  so that the fraction become $\frac{4}{9}$, is: 

Mukesh purchased $40$ kg of wheat at $Rs. 12.50$ per kg and $25$ kg of wheat at $Rs. 15.10$ per kg. He mixed the two qualities of wheat for selling. At what rate should it be sold to gain $10\%$?

Simplify $10\frac{1}{8} of \frac{12}{15}÷ \frac{35}{36} of \frac{20}{49}$ .

Simplify $\frac{3}{4} ÷ 2\frac{1}{4} of \frac{2}{3} - \frac{{\displaystyle \frac{1}{2}-\frac{1}{3}}}{\frac{1}{2}{\displaystyle +}\frac{1}{3}} \times 3\frac{1}{3} + \frac{5}{6} = ?$

In an examination, there were $2000$ candidates, out of which $900$ were boys and the rest were girls. If $32\%$ of the boys and $38\%$ of the girls passed, then the percentage of failed students is: 

If $a=\frac{\sqrt{3}}{2}$, then $\sqrt{1+a}+\sqrt{1-a}=?$ 

If $\sqrt{3} = 1.732$, then the value of $\frac{1}{\sqrt{3}}$ is: 

Six bells commence tolling together and toll at intervals of $2 , 4 , 6 , 8 , 10 , 12$ seconds, respectively. In $30$ minutes, how many times do they toll together?