SAS
data a;
input name$chi eng;
cards;
a1 80 100
a3 60 0
a2 100 90
run;
data b;
input name$chi eng;
cards;
a4 60 70
a5 20 50
a6 40 50
run;
proc sort data=a;
by name;
run;
proc sort data=b;
by name;
run;
data c;
merge a b;
by name;
run;
proc means;
run;
proc print;
run;
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