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1720+85x=79(22+x)
1720+85x=1738+79x
85x-79x=1738-1720
6x=18
x=18/6=3
b. median
diurutkan 70,70,70,70,75,75,75,75,75,75,75,75,80,80,80,80,80,80,85,85,85,90,90,90,90
median = =angka yang ke 13=80
79(22+a)=1720+85a
1738+79a=1720+85a
1738-1720=85a-79a
18=6a
a=3
b)median= (70+90)/2=80