One hundred families each have 2 fish. Each fish has either one stripe or two stripes. In total, there are 273 stripes. How many one-striped fish are there in total?

let x be the number of fish with one strip and y be the number of fish will two stripes.

You have

x+y = ?

and

x+2y = ?

Fill in the question marks and then solve the equations simultaneously.

Please no one answer over me.

What are the values of my question marks ?