Savings 31311

Petr spent a fifth of his savings on a compact disc and 25% on a book on nature. He has 550 CZK left. How many crowns did Petr save?

Correct answer:

x =  1000

Step-by-step explanation:

x-x/5-0.25x = 550

x-x/5-0.25·x = 550

2.75x = 2750

x = 2750/2.75 = 1000

x = 1000

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