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mis 7 bil=x maka
65=x/7
x=65.7
x=455
13 bil=7 bil+6 bil
mis 6 bil=y
72=x+y/13
72=455+y/13
455+y=72.13
455+y=936
y=936-455
y=481
20 bil= 2.7bil +6 bil
20 bil=2x+y
maka nilai rata2 nya
mean=2x+y/20
m2an= 2(455)+481/20
mean=910+481/20
mean=1391/20
mean=69,55