Answer :
2,700 people are expected to experience a side effect.
3 divided by 70 = 0.042857142857143
0.042857142857143 x 63,000 = 2,700
check work:
2,700 divided by 3 = 900
900 x 70 = 63,000
3 divided by 70 = 0.042857142857143
0.042857142857143 x 63,000 = 2,700
check work:
2,700 divided by 3 = 900
900 x 70 = 63,000