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The total of the ages of four persons is...

The total of the ages of four persons is 86 years. What was their average age 4 years ago?
चार व्यक्तियों की कुल आयु 86 वर्ष है। 4 वर्ष पहले उनकी औसत आयु क्या थी?

A

20 years

B

19.5 years

C

17.5 years

D

20.5 years

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