What is the factor of dialation

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Plzzz answer both questions and i will give you 100 points

In a fruit survey, 300 children choose their favorite fruit out of apples, bananas, and watermelon. 150 chose apples and 90 chose bananas. what percent chose watermelon?