Hotel

The rooms in the mountain hotel are double and triple. Double rooms are 25 and triple are 17 more. How many rooms are there in this hotel?

Correct result:

s =  67

Solution:

$$\begin{gathered} a=25 \\ b=a+17=25+17=42 \\ l=2\cdot a+3\cdot b=2\cdot 25+3\cdot 42=176 \\ s=a+b=25+42=67 \end{gathered}$$

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