The average of 25 numbers is 12. If the average of the first 13 numbers be 4 and the average of last
13 numbers be 6, then the middle number is
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Step-by-step explanation:
Average of 25 no.=12
total of 25 no. =25×12=300
Average of first 13 no.=4
total of first 13 no.=4×13=52
Average of last 13 no.=6
total of last 13 no.= 6×13=78
middle no.=total of 25 no. -(total of first 13 no.+total of last 13 no.) =300-(52+78)
=300-130=170.
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