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Rahul's phone storage was initially filled with unnecessary data. He deleted 30% of the data, and later deleted another 10% of the remaining data. If the final amount of data left is 63 GB, what was the original amount of data in his phone?

Evaluate: 11 + 8 ÷ 4 - 2 × 9

Four equal cubes are placed adjacently in a row. Find the ratio of total surface area of the new cuboid to that of the sum of the surface areas of the four cubes.

Two successive discounts are applied: the second is always 50% of whatever remains after the first. If the total discount is 60%, what is the first discount percentage?

Aarav can do a piece of work alone in 6 days and Babita can do it alone in 8 days. Aarav and Babita undertook to do it for ₹2,400. With the help of Chaitanya, they completed the work in 3 days. How much is to be paid to Aarav?

A and B start a partnership with capitals in the ratio 3:5. After 5 months, C joins with a capital equal to half of A's. If the total profit at year-end is ₹33,600, what is C's share? (Round your answer to the nearest rupee.)

A runner covers equal distances at 10 km/h, 12 km/h, and 15 km/h. What is the average speed of the runner?

Three taps A, B, and C can fill a tank in 12, 15, and 20 hours, respectively. Tap A is kept open all the time. Tap B is opened together with A for 1 hour, then tap C is opened together with A for the next hour, and this pattern is repeated alternately. In how many hours will the tank be completely filled?

The cost of 12 pens and 7 pencils is ₹233. If the cost of a pen decreases by ₹1.50 and cost of a pencil increases by ₹1, then the cost of 2 pens and 3 pencils is ₹48. What is the original cost of 4 pens and 5 pencils?

A car covers first 40% distance at 30 km/h, next 40% at 45 km/h, last 20% at 90 km/h. What is the average speed? (Rounded to the nearest integer)