Question 1066586
Is 200 lbs of potatoes his original amount or is it the new decreased amount? 
It's not clear. 
If it's the original amount, then he needs to order,
{{{N=200(1/3)=200/3=66.67}}}{{{lbs}}} or {{{67}}}{{{lbs}}}
If it's the decreased amount, then he originally ordered,
{{{(1/3)N=200}}}
{{{N=600}}}{{{lbs}}}