Bucket of lemons picked by Keith = [tex]\frac{7}{15}[/tex]
Bucket of lemons picked by Sally = [tex]\frac{3}{5}[/tex]
We have to determine the more buckets Sally picked.
The more buckets which Sally picked is determined by subtracting the bucket of lemons picked by Keith from bucket of lemons picked by Sally.
More buckets picked by Sally
= [tex]\frac{3}{5} - \frac{7}{15}[/tex]
The LCM of 5 and 15 is 15.
= [tex]\frac{9-7}{15}[/tex]
=[tex]\frac{2}{15}[/tex]
Therefore, Sally picked [tex]\frac{2}{15}[/tex] more bucket of lemons then Keith.