We will write an equation to find the original cost as follows:
![15.50=(x)/(3)](https://img.qammunity.org/2023/formulas/mathematics/college/s1fxvpb2k5r4tehszwtoeao9p9rv6n0brj.png)
And the general equation will be:
![y=(x)/(3)](https://img.qammunity.org/2023/formulas/mathematics/high-school/rhplhyqb1qiwbez003gt4hk7lstefb7mb1.png)
Here y is the price after discount and x the price without discount.
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Since we have that the price is a third of the original, then the discounted price is found by multiplying the original value of the shoe times 1/3. After this operation takes place, the value we will obtain is the discounted prices [1/3 their original value].