Question 566580
The ratio of the weight of an object on Mars to its weight on Earth is 9 to 25.
 If a person weighs 120 pounds on Earth, how much would the person weigh on Mars?
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These are just ratio equations, quite easy.
let m = his weight on Mars
{{{m/120}}} = {{{9/25}}}
cross multiply
25m = 120 * 9
25m = 1080
m = {{{1080/25}}}
m = 43.2 lb on Mars
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A flagpole casts a shadow of 8.5 meters long.
 If an algebra student 1.6 meters tall casts a shadow of 2.0 meters long at the same time and location, how tall is the flagpole in meters? 
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Similar triangles, the corresponding sides have the same ratio
let f = height of the flag pole
{{{f/1.6}}} = {{{8.5/2}}}
Cross multiply
2f = 1.6 * 8.5
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You should be able to finish this one, just like the 1st one