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diket : ipa 12, mtk 13 ipa , mtk & ipa 10, semesta (kseluruhan) 25
dtnya : tidak suka kedua dunya (dsimbolkan x)
djwb : 12-10 + 13-10 + 10 +x = 25
2+3+10+x = 25
15 + x = 25
x= 25-15
x=10
nomer 7
diket : voli 25, basket 20 smesta 36
dtnya : suka kedua duanya
djawab : 25+20 = 45
36 - 45 = 9 org yg suka kedua duanya