Quantitative Aptitude - Arithmetic Ability Questions

Simple interest on a sum for eight months at 6% per annum is Rs 340.What is the value (in Rs) of sum?

A can do 75% of a job in 18 days and B can do 25% of the job in 12 days. If they work on it together, in how many days can they do 75% of the job?

If A = 232, B = 231+ 230+ 229+ ... + 20and C = 315+ 314+ 313+ ... + 30, then which of the following option is TRUE?

If each median of an equilateral triangle has a length of 12cm. Then what will be the value of in-radius (in cm) of the equilateral triangle?

The standard deviation of the set {10, 10, 10, 10, 10} is

If a vendor sells a coconut at Rs 24 he makes 20% loss. If he sells at Rs 36 then what is his profit percentage?

If a number is decreased by 10%, it becomes 54. To make it 72, it should be increased by

A does 30% of a work in 30 days. He then calls in B and they together finish the remaining work in 20 days. How long B alone would take to do the whole work?