Pump A can fill a tank in 10 minutes, while pump B can fill the same tank in 15 minutes. Both pumps are turned on together to fill the empty tank, but when tank became half full, pump B stops working and rest of the tank is filled by pump A only. How long it took to fill the tank?
The cost of a doll is a two digit number (for example $xy). Its selling prices has same digits as cost with digits interchanged ($yx). If its profit margin is divided by 9, find the remainder of division.
There are 43 employees in a company working in three shifts. The first group of 11 employees work from 09:00 AM to 12:00 PM. The second group of 17 employees work from 10:00 AM to 02:00 PM. The third group of 15 employees work from 12:00 PM to 02:00 PM. If there are only 4 computers available, find the time during which the computers are likely to be used the most?
Find the compound interest of ^@ $80000 ^@ after ^@ 2 ^@ years, compounded annually. The rate of interest is ^@ 7 \% ^@ per annum during the first year and ^@ 10 \% ^@ per annum during the second year.