Answer: 1/5
Explanation:
Fraction of crackers eaten by Harry: 1/2
Fraction of crackers eaten by Samantha: 7/10
Fraction of crackers eaten more by Samantha: 7/10 - 1/2
= 7/10 - 5/10 ( LCM of denominators - 2,5 = 10 )
= 2/10
= 1/5
∴ Samantha ate 1/5 of serving of crackers more than Harry did.