You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
The cost is (26*2)*3.5 = 182p.
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You'd have no problem at all if it was [ 26 pigs + 1 quart + 1 rat + 4 quarts + 5 rats ]. You'd add up the quarts, and then you'd add up the rats. You do the same with p's, q's, and r's . 26p + q + r + 4q + 5r = 26p + 5q + 6r
Well honey, you can make 26 cents with 26 pennies, 5 nickels and 1 penny, 2 dimes and 6 pennies, or just 1 quarter and 1 penny. That's a total of 4 different ways to make 26 cents using those coins. Math can be a real hoot sometimes, can't it?