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 (6m)
y =  6 (8m)


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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