Question 84665
The body mass index is a measure of the risk of heart disease. It is given by  the following formula:

      I =  704.5 W

H2  Where W = weight in lbs and H = height in inches 

      An index greater than 25% indicates that a person IS at risk for a heart  attack. If Mary’s height is 65 inches what should her weight be  maintained at or under?
:
I am going to assume that the formula should be:
I = {{{704.5W/H^2}}}; 
:
Find W
{{{704.5W/65^2}}} =< 25
{{{704.5W/4225}}} =< 25
:
Multiply both sides by 4225 and you have:
704.5W =< 25*4225
:
704.5W =< 105625
:
Divide both sides by 704.5 and you have:
W =< {{{105625/704.5}}}
W =< 149.9 lb:
:
:
Check solution on good calc: enter: (704.5*149.9)/65^2 = 24.995 ~ 25%