Quantitative Aptitude - Arithmetic Ability Questions

Ravi had five subjects in his final examination. The maximum marks in each subject are 100. If his percentage in four subjects is 80, and he scores 65 marks in the fifth subject, determine his overall percentage for the five subjects.

The LCM of 56, 84 and 112 is

Find the LCM of 12, 16, 20 and 24.

Two donkeys are standing 400 meters apart. First donkey can run at a speed of 3 m/sec and the second can run at 2 m/sec. If two donkeys run towards each other after how much time (in sec) will they bump into each other?

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

√(cosec2 -­ 1)/cosecA is equal to?

In a mixture, water and milk are in the ratio of 3 : 5. In the second mixture, the ratio of water and milk is 9 : 11. If these two mixtures be mixed to form anew mixture in which water and milk are in ratio 5 : 7, then what is the ratio of these two mixtures in the new mixture?

Which one of the following is the minimum value of the sum of two integers whose product is 24?