30% of a certain number is 15. Find 25% of that number.
Find the one that does not belong to that group.
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
A train 100 meters long completely crosses a 300-meter-long bridge in 45 seconds. What is the speed of the train?
Iron is 15 times as heavy as zinc and steel 11 times. In what ratio should these metals be mixed so that the mixture may be 14 times as heavy as iron?
A student scores an average of 74 marks in 6 subjects. If the highest and lowest marks are not considered, the average marks is 77. If the highest mark is 91, find the lowest mark.
A person took a certain amount with some interest for 2 years. If the interest rate is increased by 1%, the person paid an additional Rs.120. What was the original amount taken?
If simple interest on a certain sum for 15 months at 7(1/2) % per annum exceeds the simple interest on the same sum for 8 months at 12(1/2)% per annum by Rs. 32.50, then the sum (in Rs.) is
20 buckets can fill a tank when the capacity of each bucket is 12 liters. If the capacity of each bucket is 10 liters, find the number of buckets required to fill the tank.
A man saves 20% of his monthly salary. If due to the increased cost of living, he needs to increase his monthly expenses by 20%, he is only able to save Rs. 200 per month. What is his monthly salary?