Quantitative Aptitude - Arithmetic Ability Questions

The ratio of present ages of L and N is 7 : 5. If the age of N after seven years will be 32 years, then what is the present age (in years) of L?

Mishti's birthday is on Thursday 27th April. On what day of the week will be Aradhya's Birthday in the same year, if Aradhya was born on 20th October?

If 10x/3 + 5/2(2 - x/3) = 7/2, then the value of x is?

In how many years will Rs 2,000 yield Rs 662 as compound interest at 10% per annum compounded annually?

If tan θ + cot θ = x, then what is the value of tan4θ + cot4θ?

What is the value of Sin 30° + 2 Cos 30° ?

If xy = -18 and x2+ y2= 85, then find the value of (x + y).

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is