Children and trip

The price of a one-day trip for an adult is CZK 185. The discount for a child is 50 CZK. How many crowns will the trip cost a family of four (parents and two children)?

Correct answer:

x =  640

Step-by-step explanation:

d=185 z=d50=18550=135  x=2 d+2 z=2 185+2 135=640

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