Ski lessons

On the ski course leaves 80 pupils. They live in triple and quadruple rooms. Count if rooms is the 23. How many are triple and quadruple rooms?

Correct result:

x =  12
y =  11


3x+4y = 80
x+y = 23

3•x+4•y = 80
x+y = 23

3x+4y = 80
x+y = 23

x = 12
y = 11

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