Question 1204245
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Note that ".33" is not a very good decimal approximation of "1/3".  Why would you use a 2-digit decimal approximation for 1/3 when the denominator of the fraction is a single digit?  Fewer digits nearly always means easier arithmetic.<br>
(4)(.33)(3000) = 4(990) = 3960 (not a very good approximation)<br>
(4)(1/3)(3000) = 4(1000) = 4000 (exact)<br>
In the work you show, you have the following:<br>
 1:2:5 --> 1 + 2 + 5 = 8<br>
The standard way of using a given ratio to set up a problem for solving makes it easier to see how to finish the problem:<br>
 1:2:5 --> 1x+2x+5x=8x<br>
Then<br>
8x=4000<br>
And from there it should be easy to find the values of 1x, 2x, and 5x, which are the answers to the problem.<br>