Quantitative Aptitude - Arithmetic Ability Questions

A person lent certain sum of money at 10% per annum simple interest. In 20 years the interest amounted to Rs 500 more than the sum lent. What was the sum lent (in Rs)?

∆PQR is right angled at Q. If cosecP = 17/15, then what is the value of sinR ?

If l + m + n = 9 and l2+m2+n2 = 31, then the value of lm + mn + nl will be

What is the measure of an interior angle of a regular decagon?

x, y and z are prime numbers and x + y + z = 38. What is the maximum value of x?

If a – (1/a) = b, b – (1/b) = c and c – (1/c) = a, then what is the value of (1/ab) + (1/bc) + (1/ca)?

A milk merchant buys 50 litres of milk at the rate of Rs 40 per litre and mixes 5 litres of water in it. If he sells this mixture at the rate of Rs 42 per litre, then what is the profit percentage for the dealer?

The sum of money that will yield Rs. 60 as simple interest at 6% per annum in 5 years is