How can i do it?

Question

I am new at this
https://code.sololearn.com/cmab9As0ve7Z/?ref=app

Answer 1

You need double quotes around #{age} like this:
age = 42
one = "He is "
two = " years old"
print(one+"#{age}"+two)

Answer 2

Thank you

Answer 3

You can write it easier :
age = 42
Puts "He is #{age} years old. "

Answer 4

thankful