tolong di jawab ....

a. 20 orang
b.
ipa  5/50 = 10 %
b.ing 12/50 = 24 %
b.indo 13/50 = 26 %
mtk 20 / 50 = 40 %

Jadikan yang terbaik ya ! (hehehe )

a.Total = 50 orang
     IPA = 5 orang
     B.Indo = 12 orang
     B.Ing  = 13 orang
     Math = sisanya
Math = Total - IPA - B.Indo - B.Ing
Math = 50 - 5 - 12 - 13
Math = 20 orang

b. Presentasinya:
Math = [tex] \frac{20}{50} [/tex] x 100% = 40 %
IPA = [tex] \frac{5}{50} [/tex] x 100% = 10 %
B.Indo = [tex] \frac{12}{50} [/tex] x 100% = 24%
B.Ing = [tex] \frac{13}{50} [/tex] x 100% = 26 %