Henrietta will create more bracelets per minute because sydney creates 24/40 of a bracelet per 10 seconds compared to sydney who makes 25/40 of a bracelet per 4 seconds.
You will first add all the students the mentioned which gives you 13 then since they ask what is the probability it the teacher would pick girls. You know there's 10 girls and 3 boys so it would be 10/13.
