That's a score of 87.5%, and it's up to the teacher to decide what grade it gets.
One possibility is (21 - 21) * 13 + 24 = 24
Average of 21, 24, 21 and 23 = (21+24+21+23)/4 = 22.25
21 24 means : The time is 21 ( p.m ) and 24 minutes .
24
24
21
24 multiplied by 21 is 504.
21
0.875
I am a grade 21 and my salary is approx. $35k a year.
The GCF is 24.
90.5% or A-