Quantitative Aptitude - Arithmetic Ability Questions

A shopkeeper by selling 21 Nike shoes, earns a profit equal to the selling price of 5 Nike shoes. His profit percentage is

Seven years ago, the age of Sahil was equal to the present age of Nihal. Sum of Sahil's age 5 year ago and Nihal's age 6 years later is 58 years. If Ruchi is 4 years elder to Sahil, then what will be Ruchi's age (in years) after 10 years?

If two marbles are picked at random, what is the probability that either both are red or both are green?

If 3a=4b=6c and a+b+c=279 then a2+b2+c2 is equal to

A water tank is 2/5 th full. Inlet A can fill the tank in 12 minutes while an outlet pipe B can empty it in 6minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

If √(1 - cos2A) = x, then the value of x is

If 11+11+11+1x = 58, then what is the value of x?

The length of the diagonal and the breadth of a rectangle are 17 cm and 8 cm respectively. Find its perimeter (in cm).