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nilai rata2 20 nak = 6,2
nilai rata2 di tmbh 5 anak = 6,36
maka :
Jmulh nilai 20 anak = 20 x 6,2 = 124
Jmulh nilai 25 anak = 25 x 6,36 = 159
jadi nilai rata2 5 anak = (159-124)/5 = 7,0 (A)
124 + 5x / 25 = 6,36
124 + 5x = 159
5x = 159 - 124
5x = 35
x = 35 / 5
x = 7,0