Question 1153935
p for price
q for quantity
v for cost
{{{pq=v}}}
<pre>
             possible Variable             PRICE        QUANTITY        COST

Gummy Worms     w                          1.00         3c             1*3c

Candy Corn      c                          3.00          c             3*c

SourBalls       b                         1.500         b             1.5b

TOTAL                                                   10             15
</pre>

{{{system(3c+b=10,6c+1.5b=15)}}}


Simple substitution  (for b)  can turn this easily into one equation in one unknown, c.