Quantitative Aptitude - Arithmetic Ability Questions

Two numbers are in the ratio 2:5 and their HCF is 18. Their LCM is

A truck moves at the speed of 90 km/hr after repairing and moves at the speed of 80 km/hr before repairing. It covers x distance in 8 hours after repairing. How much time (in hours) will it take to cover 4x distance before repairing?

20 boys do one fourth of work in 25 days. How many more boys will be required to complete the remaining work in 50 days?

Study the information carefully to answer the following questions: An urn contains 5 red, 3 green, 2 blue and 4 yellow marbles. If three marbles are picked at random, what is the probability that one is green and two are yellow?

P bought an article for Rs. 1600 and sold it at a profit of 10%. What would have been the increase in the profit percent if it was sold for Rs. 1840?

P and Q can do a project in 12 and 12 days respectively. In how many days can they complete 50% of the project if they work together?

If x1/4 + x-1/4 = 2, then what is the value of x81 + (1/x81)?

The simplest form of 3774/2958 is