Dining room

The dining room has 11 tables (six and eight seats). In total there are 78 seats in the dining room. How many are six-and eight-seat tables?

Correct result:

x =  5
y =  6


 x+y=11 6x+8y=78  x+y=11 6 x+8 y=78  x+y=11 6x+8y=78  x=5 y=6

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