TNPSC Group 2 Official Paper (2016)

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

If $\frac{a}{b}=\frac{4}{5}$ and$\frac{b}{c}=\frac{15}{16}$ then, the value of $\frac{c^2-a^2}{c^2+a^2}$ is

Find the odd number in the series given 25, 36, 49, 81, 121, 169, 225

A can do a certain job in 12 days. B is 60% more efficient than A. How many days does B alone take to do the same job?

If 5 ${}^a$ = 6 ; 6 ${}^b$ = 7 ; 7 ${}^c$ = 5, then find the value of abc.