Question

30,45,x,100; the mean is 60

Answer 1

x=65

Explanation:

Mean= sum of terms

number of terms

60=30+45+x+100

4

240=175+x

x=240-175

=65

Answer 2

if there are 4 numbers that average to 60, when mutiplied they must come up to: 60*4= 240

100+30+45= 175

240-175= 65

PROOF:

100+30+45+65= 240

240÷ 4

= 60