The mean of twenty numbers is 42. If four of the

twenty numbers have a mean of 50, what is the

mean of the other sixteen numbers?

mean of other sixteen numbers is 40

Step-by-step explanation:

let the total of 20 numbers be x

x/20 = 42

20*x/20 = 42*20

x=840

let the total of four numbers be y

y/4=50

4*y/4 = 50*4

y=200

so as to get the difference of x - y

=840-200

=640

the average of sixteen numbers

=640/16

=40

therefore the mean of sixteen numbers is 40