The average of 12 numbers is 39. the average of last 5 numbers is 35 and that of 1st 4 numbers is 40.the 5th number is 6 less than the 6th number and 5 more the 7 number. the average of 5th and 6th number is how much
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Step-by-step explanation:
The average of 45 numbers is 9. So, the total is 45∗9=405.
The average of the first 20 is 10. So, the total there is 20∗10=200.
The average of the last 24 is 8. So, the total there is 24∗8=192.
So, the total of 44 numbers is 200+192=392 and the last number must be 405−392=13.
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