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How many times does the digit 7 appear when writing all the numbers from 1 to 100?
Raja covers half of the total distance at 11 km/h and the other half at 22 km/h. What is his average speed in km/h?
In how many ways can 4 men and 3 women be arranged such that the men are not seated together and they are in order of their age?
From the numbers 1 to 60, the numbers divisible by 5 and the numbers with 3 as one of the digits are removed. How many numbers remain?
From a pack of cards two cards are drawn one after the other, with replacement. The probability that the first is a red card and the second is a king is
Each question has an underlined word followed by four answer choices. You will choose the word that is a necessary part of the underlined word.
Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, how long will it take to fill the tank?
Two trains of equal length, running with the speeds of 60 km/h and 40 km/h, take 50 seconds to cross each other while they are running in the same direction. What time will they take to cross each other if they are running in opposite directions?