Multiple choice

The average age of a five member family is 20, if one member goes then average is equal to 15. what is the age of member which was gone? एक परिवार के पांच सदस्यों का औसत 20 है। यदि एक सदस्य चला जाता है तब परिवार का औसत 15 के बराबर हो जाता है । उस सदस्य की उम्र क्या होगी जो चला गया था?

  1. 20

  2. 30

  3. 40

  4. 50
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For 5 members with average age 20, total age = 5 x 20 = 100 years. When one member leaves, 4 members remain with average 15, so their total age = 4 x 15 = 60 years. The age of the member who left = 100 - 60 = 40 years. This follows directly from the definition of average.

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