Quantitative Aptitude - Arithmetic Ability Questions

A certain sum of money becomes 4 times of itself in 30 years at a rate of simple interest. In how many years it will become double of itself at the same rate of simple interest?

If the time increases by 7 years, then simple interest increases by Rs 8400 on a sum of Rs 6000. What is the rate (in percentage) of interest per annum?

If two successive discounts of 50% and 10% are offered, then what is the net discount (in %)?

Point Q(-2,b) is the midpoint of segment EF. Co-ordinates of E are (-7,-6) and F are (a,0). What is the value of a and b?

What is the value of (1 + cotA)2 + (1 -­ cotA)2?

The area of a circle is 616 sq.m. Find its diameter.

What is the value of cosec 5π/3?

tanAcosec2A is equal to