Find the missing number:
1, 4, 9, 16, 25, 36, 49, _____
Look at this series: U32, V29, ____, X23, Y20, ... What number should fill the blank?
Find the number that is not a composite number in the following sequence:
4, 6, 8, 9, 10, 11, 12
In a tennis tournament with 15 players, each player plays twice against every other player. How many total games will be played?
There are 6561 balls, and one of them is heavy. What is the minimum number of times the balls need to be weighed to find the heavy ball?
How many times do the six bells toll together in 30 minutes if they commence tolling together and toll at intervals of 2, 4, 6, 8, 10, and 12 seconds respectively?
In a 50 gm alloy of gold and silver, the gold content is 80% by weight. How much additional gold should be mixed with this alloy so that the gold content becomes 95% by weight?
The first number is 40% less than a third number, and the second number is 47% less than the same third number. What percentage is the second number less than the first number?
Spot the part that has error in it.
Each of the speakers whom I invited (A) / to participate in the debate has (B) / indicated their unwillingness (C) / because of the short notice (D).
There are two examination rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 students are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is: