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29+56+45+20+30+10+20 = 210 butir rata - rata bertelur setiap hari = 210 : 7 = 30 butir
Rata-Rata
banyak telur
__________
banyaknya hari
29+56+45+20+30+10+20
____________________
7
210
___
7
= 30 butir/hari
jawabannya A. 30 butir