Question 1160938
Let the price for the TUNA be assigned the variable, p.
PRICE multiplied by QUANTITY is COST.
The description can be fit into this table:
<pre>
                 PRICE        QUANTITY        COST
Milk              p+5           5
Bread             (p+5)-2       3
Tuna              p             6
TOTAL                                          146
</pre>
You should be able to fill other information, form an equation, and solve the problem.