Question 139581
if 70% of my grade is a 97, what does the other 30% need to be to add up to a grade of 90?

<pre><font size = 4 color = "indigo"><b>
70% of 97 plus 30% of X = 100% of 90.

         {{{.70(97) + .30X = 1.00(90)}}}
            {{{67.9 + .3X = 90}}}
                {{{.3X = 90 - 67.9}}}
                {{{.3X = 22.1}}}
               {{{(.3X)/.3 = 22.1/.3}}}
                 {{{x = 73}}}{{{2/3}}}

Edwin</pre>