The sender to that I think is 10
3/20. Mischa can only shake out 20 coins. And three of them would be pennies. So the chance is 3/20
By better I am assuming you meant faster so,
18 ÷ 2 = 9
22 ÷ 2.5 = 8.8
9 > 8.8
therefore Emily has the faster rate.
What you would do is3.14*r^2
3.14*125*125 which is 49062.5ft^2
if you need to know how many each 6 inch then you would convert ft to inches which would be 588750in then divide it by 6 which will be 98125 flowers are needed to surround a cicular garden