Ski lessons

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

Correct answer:

x =  12
y =  11

Step-by-step explanation:

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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