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M=4H/5
Reemplazando en:
M=H-20
4H/5=H-20
4H=5H-100
100=H
En la reunión hay 100 hombres
17.
1+2+3+4+...+n=n(n+1)/2
(x+1)+(x+2)+(x+3)+ ....+(x+n)= n²
xn+n(n+1)/2=n²
2xn+n²+n=2n²
2xn+n=n²
n(2x+1)=n²
2x+1=n
2x=n-1
x=(n-1)/2
Respuesta E