Question 1031026
This should or can be split into two separate problems.  


Here is the first problem:
own proprietary blend of topsoil that costs $29.55 per ton to make. The blend contains soil that costs $25.05 per ton and organic compost that costs $36.30 per ton.
Solve for the proportions of the two materials making the topsoil.



Then the second problem:
the company already has 3 tons of soil on hand, how many tons of compost do they need to mix in? 
This is turned into simply a proportion problem, or the equality of two ratios.



You might try handling the first problem using just a single variable, say x for the tons of the $25.05 soil; and 100-x for the tons of the $36.30 per ton organic compost; and this would be for 100 tons of the proprietary blend.  The pricing is per TON.  Look at COST per TON.
-
{{{25.05*x+36.30(100-x)=100*29.55}}}, which accounts for cost, based on making 100 tons of proprietary blend.


Solve for x and compute 100-x.
Then go to problems number 2.