Math, asked by rithiksandron6p7xfwp, 11 months ago

If the average of twenty numbers is 18, that of first 9 is 14 and that of last 9 is 17, then the average of middle two numbers is_

Answers

Answered by subramanish

2

Step-by-step explanation:

20×18=360

9×14=126

9×17=153

Add 126+153=279

Subtract total average - 279

360-279=81

Average of this two middle numbers is 81/2=45.5

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