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---------------------- = 62
20+x
1200+70x
------------- = 62
20+x
1200 + 70x = 62 (20+x)
1200 + 70x = 1240 + 62x
70x - 62x = 1240 - 1200
12x = 40
x = 3,33
x = 4
Insyallah, jawabannya yang B