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:

a=25 b=a+17=25+17=42 l=2⋅ a+3⋅ b=2⋅ 25+3⋅ 42=176 s=a+b=25+42=67

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