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?

Final Answer:

x =  12
y =  11

Step-by-step explanation:

3x+4y=80 x+y=23  3 x+4 y=80  Row231 Row1Row2 0.33y=3.67  y=0.333333333.66666667=11 x=3804y=3804 11=12  x=12 y=11



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