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Answer: 15 Gray or white Marbels!
Step-by-step explanation:
East= 45 x 22 = 990 students
west= 42 x 23 = 996 students
996 - 990 = 6 students
990 - 996 = -6 students
There are 6 more students at West school than East school. There are -6 more students at East school than West school.
Hope it helps!
I believe this is the way to solve it.
22 - 2 = 20
20 is 90.9% of 22
So the probability of choosing a student with a sibling at random should be 90.9% (or you can round up to 91%)
I hope this helps :)