Four friends each flipped a coin different numbers of times. Alice got heads 75% of time. Mary got heads 8 out of 10 times. Sarah got heads 17 out of 20 times. Ellen got heads 3 5 of the time. who had the greatest percentage of heads?

Alice got heads 15/20 times because 75%.
Mary got heads 16/20 times so 80%
Sarah got heads 17/20 times so 85%
Ellen got heads 15/20 times so 75%
Sarah had the highest percent
You had to make all of the numbers factor into 20 so that they are all equal and you can get the percent easiest.