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x+x/3=20 x 3
x+x/3=60
x+x=60/3
x+x=20
2x=20
x=20/2
x=10
3z+z/3= 20
3(3z+z/3= 20)
9z+z= 60
10z= 60
z= 60/10
z= 6
R. El número es 6
Comprobación:
3z+z/3= 20
3(6)+6/3= 20
18+2= 20
20= 20