The population of rodents in a house doubles every day. Every day 25 rodents are killed. How many rodents are there if after every 4 days, the number of rodents becomes same again?
25
Initial amount- x Day 1---> 2x-25 Day 2---> Day1 * 2 - 25 = 4x-75 Day 3 ---> Day2 *2 - 25 = 8x-175 Day 4---> Day3 *2 - 25 = 16x-375 = x -> 15x=375 ->x=25
A certain number of men can finish a piece of work in 30 days. If however there were 15 men less it will take 30 days more for the work to be finished. How many men were there originally?
12 labours construct 120 toys in 8 days working 8 hours per day . If two them leave the work , then how many days are required to do the same work with a working of 6 hours per day ?
If there are 4 empty seats in a theatre, how many combinations are there for the number of ways 4 people could sit in these seats?
There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of Rs. 12000 after 4 years at the same rate?
