You’re making cookies for a party. 1 of every 20 cookies falls apart. If you make 40 cookies how many will fall apart?

Question

I need help with this question. I can't figure it out.

Answer 1

1 : 20 :: x : 40       means/extremes product

40 = 20x               divide bot sides by 20

2 = x

 

You can expect two cookies to fall apart. (I always eat these!)