Question 1101357
If assumed or inferred no filler material,
<pre>
'potassium'            2x
'iron'                  x
nitrogenous iron       3x
Total                 60 pounds
</pre>

{{{2x+x+3x=60}}}

-

{{{6x=60}}}

{{{x=10}}}


-
<pre>
MATERIAL             POUNDS

'potassium'            20
'iron'                 10
nitrogenous iron       30

Total                 60 pounds
</pre>