<PRE><B>Question 867774</B>
My average in my criminology class is 68%.
 what do i need on my final test which is 20% of my grade, to get a 70 average?
:
let x = your find test grade
:
From the given information we know the final test is 1/5 of your grade
Then your grade to this point is 4/5 of your grade and is 68%
therefore
{{{((4(68)+x))/5}}} = 70
mult both sides by 5
4(68) + x = 5(70)
272 + x = 350
x = 350 - 272
x = 78% required in you Final test
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:&#39;
You can confirm this yourself in the initial equation.</PRE>