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How many terms are there in the GP 5, 20, 80, 320......................20480?

Find the remainder when the number 12345678910111213...178179 is divided by 180.

If (cos x)^2 - (sin x)^2 = -2/3, find the value of (cos x)^4 - (sin x)^4.

 Three 6 faced dice are thrown together. The probability that all the three show the same number on them is -. 

In a 1 km race, A beats B by 56 meters or 7 seconds. Find A's time over the course.

A person covers half of the distance at 15 km/hr and the rest at 25 km/hr. What is the average speed during the whole journey?

 Which of the following equations represent a circle of radius is 8 and centre at (-4,-6) 

There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of Rs. 12,000 after 3 years at the same rate? 

The difference between Simple Interest (S.I.) and Compound Interest (C.I.) for the first two years at 15% p.a. is Rs. 90. Find the Principal amount.