Question

The average of 6 numbers is 20.if one number is removed the average becomes 15.what is the number/removed

Answer 1

average of 6 no. is 20
now
sum of those 6 no. will be
20*6= 120
one no. is removed is the condition
so there were 6 no. now 1 is removed so there are now 5 no.
and average is given as 15
so sum of Those 5 no is
15*5= 75
now we have to substract 75 from 120 to get that removed no.
so
120-75= 45
so the removed no. is 45
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