(a+b+c)/3 =22
(a+b+c+d)/4=20
a+b+c=66
a+b+c+d=80
d=80-66=14
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(a+b+c)/3 =22
(a+b+c+d)/4=20
a+b+c=66
a+b+c+d=80
d=80-66=14