Answer:
There are 16 friends at Jack's party.
Explanation:
We are given the following in the question:
Let x be the number of friends at Jack's party.
Total number of chocolates Jack have = 50
Number of chocolates given to each friend = 3
Number of chocolates left = 2
Thus, we can write the equation:
Total number of chocolate - Total number of chocolates given = Total number of chocolates left

Solving the equation, we get,

Thus, there are 16 friends at Jack's party.