<PRE><B>Question 1133014</B>
x equals the price of a candy bar.
y equals the amount of money they both started out with.


your equations are:


for joanie, y - x = 70


for tony, y - 3x = 20


these are two equations that need to be solved simultaneously.


subtract the second equation from the first to get:


2x = 50


solve for x to get x = 25


for joanie, y - 25 = 70.


solve for y to get y = 95 cents.


for tony, y - 3 * 25 = 20 which becomes y - 75 = 20.


solve for y to get y = 95 cents.


they both started out with 95 cents.


the price of one candy bar was 25 cents.


95 - 25 = 70 which is what joanie had left.


95 - 3 * 25 = 20 which is what tony had left.





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