Average of 7 no is 60.average of first 3 no is 50 and average of last three no is 70. what is the remainin number?
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average=60
sum=60×7=420
first 3nos average=50
sum=50×3=150
last 3nos average=70
sum=3×70=210
then remaining no=420-150-210
=420-360
=60
sum=60×7=420
first 3nos average=50
sum=50×3=150
last 3nos average=70
sum=3×70=210
then remaining no=420-150-210
=420-360
=60
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