Find the wrong number in the sequence:

2880, 480, 92, 24, 8, 4, 4

What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?

If (x-3) is one of the factors of x^2 - 12x+27, find the other factor.

In what time will ₹1,000 become ₹1,331 at 10% per annum compounded annually?

The price of an article has been reduced by 25%. In order to restore the original price, the new price must be increased by:

 When difference between compound and simple interest for three years is Rs. 122 at 5% rate per annum, the principal is ______ 

4 girls can write 20 pages in 5 days working for 6 hours a day. If 5 girls work for 8 hours a day, then how many days will they take to finish the same 20 pages?

A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?

In a survey, it was found that 80% of those surveyed owned a car, while 60% owned a mobile phone. If 55% owned both a car and a mobile phone, what percent of those surveyed owned a car or a mobile phone or both?

Suresh invested a sum of Rs. 15,000 at 9% per annum simple interest and Rs. 12,000 at 8% per annum compound interest for a period of 2 years. What is the total interest Suresh earned in 2 years?