1.

The average of first three of five number arranged in ascending order is 20 less than the average of the last three of these numbers. If the sum of the last three of these numbers is 65. What is the sum of the first three of the numbers?1). 152). 53). 124). 9

Answer»

LET the numbers be p, Q, R, s and t

According to question

⇒ (p + q + r)/ 3 = {(r + s + t)/3} – 20

⇒ p + q + r = r + s + t – 60

⇒ p + q = s + t – 60 ….. 1

Given,

⇒ r + s + t = 65

⇒ s + t = 65 – r …….2

Putting the value of s + t in 1 we get

⇒ p + q = 65 – r – 60

∴ p + q + r = 5


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