7 students carrying a backpack out of 10 total students = 7/10
700 students attending divided by 10 students from formation, equals 70
in multiplication, it would be 70 • 10 = 700
do the same to the numerator of the fraction
7 • 70 = 490 students carrying a backpack
so, your final answer would be:
if 700 students are attending this assembly, based o the formation, 490 students would be carrying a backpack