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The average of 20 numbers is 65. The ave...

The average of 20 numbers is 65. The average of the first 9 numbers is 68 and the average of next 8 numbers is 62. If the 18th number is 3 more than 19th number and 9 less than 20th number, then what is the average of 19th and 20th number?
20 संख्याओं का औसत 65 है | पहली 9 संख्याओं का औसत 68 तथा अगली 8 संख्याओं का औसत 62 है | यदि 18वीं संख्या 19वीं संख्या से 3 अधिक तथा 20वीं संख्या से 9 कम है, तो 19वीं और 20वीं संख्या का औसत ज्ञात करें |

A

64.5

B

66

C

65

D

65.5

Text Solution

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The correct Answer is:
C
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