Twelve ties

The price of 12 ties before the discount was the same as 15 ties after discount. Calculate the price of 1 tie after discount, if you know that the discount price of one tie fell by 40 CZK?

Correct result:

x =  160 CZK


12y = 15x
x = y-40

12•y = 15•x
x = y-40

15x-12y = 0
x-y = -40

x = 160
y = 200

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