cheryl scores 68 out of 80 on her science test, nadia scores 86 out of 120 on her science test and a

cheryl scores 68 out of 80 on her science test, nadia scores 86 out of 120 on her science test and ali scores 120 out of 150 on her science test. who preforms the best in his/her science test

Cheryl: 68/80 = 85%
Nadia: 86/120 = 71.67%
Ali: 120/150 = 80%

Cheryl has the highest percentage, so she did the best on her test.