A can paint a house in 55 days and B can do it 66 days. Along with C, they did the job in 12 days only. Then, C alone can do the job in how many days?

Ramesh can do a work in 21 days and Mahesh in 42 days. If they work on it together for 7 days, then what fraction of work is left?

Giving two successive discount of 25 % at a article is equal to giving one discount of ___%.

The average weight of a group of 20 boys was calculated to be 89.4 kg and it was later discovered that one weight was misread as 78 kg instead of 87 kg. The correct average weight is 

According to the will the wealth of Rs. 21,25,000 was to be divided between the son and the daughter in the ratio $$ {7\over6}:{5\over3}$$. How much did the son get (in Rs.)?

Among three numbers, the first is twice the second and thrice the third. If the average of the three numbers is 49.5, then the difference between the first and the third number is: 

If Rs. 25,000 is to be divided between A, B and C in the ration 1/10 : 1/6: 1/15, then how much will C get (in Rs)?

Rizwan has a box in which he kept red and blue marbles. The red marbles and blue marbles were in the ratio 5:4. After he Lost 5 red marbles the ratio become 10:9. How many marbles does he have now?