Given :
Marvelous Meals charges $700 plus $35 per person. Posh Parties charges $425 plus $50 per person.
To Find :
Which company will cost less.
Solution :
Let, after x people Marvelous Meals charge less than Posh Parties :
So, 700 + 35x < 425 + 50x
275 < 15x
x > 18.33 i.e x > 18
Therefore, after 18 people Marvelous Meals charge less than Posh Parties.
Hence, this is the required solution.