1.

1). 92). 10.53). 6.54). 21

Answer»

Given,

The average of five numbers is 11:

Total sum of five numbers = 11 × 5 = 55

Given,

FORTH number is average of third and fifth number and first number is 3/7th of the fourth number:

⇒ Fourth number = (third number + fifth number)/2

⇒ 14 = (third number + fifth number)/2

⇒ Third number + Fifth number = 28

⇒ First number = 3/7 × (fourth number)

⇒ First number = 3/7 × 14

⇒ First number = 6

Total sum of all five numbers = 55

⇒ 55 = First number + second number + third number + forth number + fifth number

⇒ 55 = 6 + second number + 28 + 14

⇒ Second number = 55 - 48

⇒ Second number = 7

The average of second number and forth number:

⇒ Average = (7 + 14)/2

⇒ Average = 21/2 = 10.5

∴ The average of second number and forth number is 10.5.



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