What's the answer of this question?

Question

Swift 4 fundamentals/The Basics/Basic Operating Systems Part 2/Ternary Conditionals/Quiz

Answer 1

90
ischeck? 50:20 means 50 if ischeck else 20

Answer 2

question starting with "guess the value stored in the rowheight" right?

Answer 3

thanks

Answer 4

but it's not getting correct...