Question 1199576
<pre>
INGRED           RECIPE        PRODUCTION
-----------------------------------------------
compoundA          4                1034-b
compoundB          7                  b
TOTAL                              1034
</pre>

b, assigned variable for the question
Recall the given ratio.


{{{(1034-b)/b=4/7}}}

-

{{{7(1034-b)=4b}}}

{{{4b=7*1034-7b}}}

{{{11b=7*1034}}}

{{{b=(7*1034)/11}}}

{{{highlight(b=658)}}}