Respuesta :

I was taught a formula for this in seven grade. 


I set it up like this

[tex]20,000/n = 1/10[/tex]


you use the cross multiply rule. 

so.. 


20,000 × 10 = 200,000


n × 1 = 1n


now your left with 


200,000/1n


200,000 divided by 1 is 200,000 


so n = 200,000