For the following questions answer them individually
The number of integers k that are divisible by 3 and satisfying the inequality $$-17 < k \leq 12$$ is
Three persons A, B and C take 27, 36 and 45 seconds respectively to run around a circular track. If all of them start at a point P on the track at the same time, after how much time (in minutes) all of them meet again at P.
The number of pairs of positive integers a and b with gcd(a ,b) = 23 and a + b = 184 is
If $$1\frac{2}{3}+4\frac{5}{6}+7\frac{8}{9}+10\frac{11}{12}=\frac{m}{n}$$ and (m, n) = 1, then m - n =
If $$a_1, a_2, a_3$$ and $$a_4$$ is the decreasing order of the elements in the set $$ \left\{\frac{2}{7}, \frac{7}{15}, \frac{5}{8}, \frac{9}{23}\right\}$$ then $$\frac{a_1 - a_4}{a_1 + a_4}=$$
The smallest fraction among the following fractions is $$\frac{2}{9}, \frac{3}{11}, \frac{4}{13}, \frac{6}{7}$$