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b
no 4. 32 siswa rata² nya 6 jd jmlh nilai 32× 6= 192
8 siswa rata² nya7 jd jmlh nilai 8×7= 56
192+ 56=248:40=6,2 d
5. seluruh siswa kls 9 a maaf klo salah...
6 . 5× ul rata²7 jmlh nilai 5×7 =35
2× ul nilai 5&8 jmlh nilai =13
35+13= 48:7= 6,8 c
8 . 72/360×45= 9 org a.
9. 35/100×180= 63 org. a