In a cinema hall for the matinee show which started at 2.30 pm and ended at 5.30 pm the vehicle parking lot had only three wheelers (auto rickshaws) and four wheelers. Today the wheels of the vehicles parked was counted and found to be 240. What could be the number of three wheelers parked therein?

a) 41 b) 43 c)45 d) 48

• ans 48
  because 3X+4y=240
  by substitute through options 48 is correct
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