Answer:
7/20
Explanation:
To find out how much longer Sarah practiced than Eloise, we need to compare the lengths of time they practiced.
To compare the two fractions, we need to find a least common denominator. In this case, the least common denominator is 20 because both 5 and 4 can be evenly divided by it.
So, let's convert 2/5 to an equivalent fraction with a denominator of 20. Multiplying both the numerator and denominator of 2/5 by 4 gives us 8/20.
Now we can compare 8/20 with 15/20 (which is 3/4 in equivalent fraction form).
Since 15/20 is larger than 8/20, we can conclude that Sarah practiced piano for a longer time than Eloise.
To find out how much longer Sarah practiced, we can subtract the time Eloise practiced from the time Sarah practiced.
15/20 - 8/20 equals 7/20.
Therefore, Sarah practiced piano 7/20 of an hour longer than Eloise.