Respuesta :
Let
x------> number of emails originally sent
we know that
[tex]4\%= \frac{4}{100}=0.04[/tex]
so
[tex]x*0.04=140[/tex]
Solve for x
Divide by [tex]0.04[/tex] both sides
[tex]x*0.04/0.04=140/0.04[/tex]
[tex]x=140/0.04[/tex]
[tex]x=3,500\ emails[/tex]
therefore
the answer is
[tex]3,500\ emails[/tex]