# Tourist cottage

The tourist cottage has 11 rooms for 16 guests, some of them are doubles, some singles. How many are double rooms and how many are single rooms?

a =  5
b =  6

### Step-by-step explanation:

11 = a+b
2a+1b = 16

11 = a+b
2•a+1•b = 16

a+b = 11
2a+b = 16

a = 5
b = 6

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