The average of 25 number is 12 the if the average of the first 30 numbers be four and the average of lot 30 numbers be sixth and the middle number is
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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.- 6x13=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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