If the sum of the digits of a three digit number is subtracted from that number, then it will always be divisible by

Three bells ring at interval of 36 seconds, 40 seconds and 48 seconds respectively. They start ringing together at a particular time. They will ring together after every

Let 0 < x < 1. Then the correct inequality is 

What is the ratio of average number of females from the organisations A, B and C to the average number of males from the organisations C, D and E?

Males from organisations A and B together form what percent of total number of males from organisations C, D and E together?

What is the ratio of the number of females from the organisations B and C to the number of males from the organisations D and E?