Average of 5 number is 12. If four of the numbers are 19, 16, 13 & 9, then 5th number will be
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let the 5th no. be x
=. (19+16+13+9+x)/5 =12
=. 57+x/5
= x=12×5-57
=. x=60-57
_______
= x= 3
________
therefore the 5th no. is 3
=. (19+16+13+9+x)/5 =12
=. 57+x/5
= x=12×5-57
=. x=60-57
_______
= x= 3
________
therefore the 5th no. is 3
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