Question 308909
{{{((5/6)r+1)>=(4/3)}}}
{{{((5/6)r+1-1)>=(4/3)-1}}}
{{{((5/6)r)>=(4/3)-(3/3)}}}
{{{((5/6)r)>=(1/3)}}}multiply by reciprical
{{{r>=(1/3)(6/5)}}}
{{{r>=(2/5)}}}