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R-2: 500alumnos-40%= 300 alumnos son el 60%
R-5:75%,son,20,chicas,falta,el,25%
20+25%=25,personas,en,la,clase
1)
640*0.80= 512 varones
640-512=128 mujeres
2)
500.................100%
300....................x
500x=300*100
500x=30000
x=30000/500
x=60%
es el 60%
3)
12*3*10/(3*30)=x gallinas
360/90=x
4=x
4 gallinas
4)
total 200 palabras
0.5min = 1 reglon
1 reglon = 12 palabras
200palabras*(1reglon/12palabras)*(0.5min/1reglon)= 8.333 min
5)
0.75=20
0.25*20=5
20+5=25personas