What did the student did wrong ? I need help plz

Shane can shovel the driveway in 4 hours, but if his sister it would take 2 hours. how long would it take taylor to shovel the driveway alone

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be