Question 429172
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Hi
 36 tables
Let x and (36-x)represent the number of 4-legged and 3-legged tables respectively
Question states***
 4x + 3(36-x) = 124
      x = 16, the number of 4-legged tables.  

CHECKING our Answer*** there are 20  3-legged (36-16)
 4*16 + 3*20 = 64 + 60 = 124 legs