The difference between the greatest and smallest 6-digit numbers formed by using the digits 5, 1, 0, 3, 9 and 6 is:

​A person withdrew ₹ 4,560 from his bank account on 4th of a month and deposited ₹ 2,567 on 20th of the same month. If at the end of the month, balance is ₹ 3,125, then money (in ₹) at the start of the month in his account was:​

​What is the result when 7kg 7g is subtracted from 9kg?​