InterviewSolution
Saved Bookmarks
| 1. |
The average of three natural numbers, P, Q and R is 35. The average of P and Q is 42 while average of Q and R is 25. What is the average of squares of P and R?1). 17332). 16193). 16614). 1793 |
|
Answer» The average of three NATURAL numbers, P, Q and R is 35. ⇒ (P + Q + R)/3 = 35 ⇒ (P + Q + R) = 105 The average of P and Q is 42 while average of Q and R is 25. ⇒ (P + Q)/2 = 42 and (Q + R)/2 = 25 ⇒ P + Q = 84 and Q + R = 50 Solving, we get Q = 84 + 50 – 105 = 29 ⇒ P = 84 – 29 = 55 and R = 50 – 29 = 21 ∴ Average of SQUARES of P and R = (55× 55 + 21 × 21)/2 = 3466/2 = 1733 |
|