40 mangoes cost $16, if the rate remains the same, how many mangoes can be purchased with $4

There are 12 boy and13 girls in a class. if the teacher randomly chooses a student’s name out of a hat what is the probability it will be a girl

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)