Question 1084492
here's a good reference.


<a href = "http://www.onlinemathlearning.com/ratio-math-problems.html" target = "_blank">http://www.onlinemathlearning.com/ratio-math-problems.html</a>


just do a search for "how to solve ratio problem with 3 ratios" and you'll find lots more websites that will attempt to explain it.


to use your question as an example:


assign variables to the ratios


i'll use one of the examples in the reference i chose to show you how it works.


Clothing store A sells T-shirts in only three colors: red, blue and green. The colors are in the ratio of 3 to 4 to 5. If the store has 20 blue T-shirts, how many T-shirts does it have altogether?


the colors are red, blue, and green.


the colors are in the ratio of 3 to 4 to 5.


this means that the ratio of red shirt to blue shirts is 3/4 and the ratio of blue shirts to green shirts is 4/5


you get:


red/blue = 3/4 and you get blue/green = 4/5


you have 20 blue shirts.


your ratio of red/blue = 3/4 = x/20


x represents the number of red shirts you need to find.


solve for x to get x = 20*3/4 = 60/4 = 15


your ratio of blue/green = 4/5 = 20/x


x represents the number of green shirts you need to find.


solve for x to get x = 5*20/4 = 25


you have 15 red shirts, 20 blue shirts, and 25 green shirts.


15/20 = 3/4


20/25 = 4/5


if you simplify 15/20, you will see that it is equivalent to 3/4


if you simplify 20/25, you will see that it is equivalent to 4/5.


the total number of shirts is 60.


check the reference and you'll see that this is correct.


here's another tutorial that might be helpful.


<a href = "http://www.purplemath.com/modules/ratio2.htm" target = "_blank">http://www.purplemath.com/modules/ratio2.htm</a>