In an exam of Science and Computers, 21% and 30% students failed in Science and Computers respectively. If 6% students failed both in Science and Computers, find the percentage of students who failed in the exam.

In a collection of purple, green, and white marbles, there are 15% more purple marbles than green marbles, and there are 50% more white marbles than purple marbles. If A is the number of purple marbles, what is the total number of marbles?

Megan and Cameron are walking around a circular park whose radius is 56 meters. If Megan and Cameron start from a point and walk in opposite direction with speed of 16 and 28 meters per minute respectively, they will meet each after _____ minutes (find time in minutes, assume π = 22/7).

Maddy is walking in east direction. After walking for 12 meters, she takes a right turn and walks for another 5 meters. She then takes a left turn and walks for 3 meters. She again takes a right turn and walks for another 3 meters. How far is she from starting point?

Katie was getting late for school, and had not yet had her breakfast. While running out the door, she picks up a fruit from the fruit basket which had the following fruits. What is the probability that Katie picked a pear?