There are 90 girls in third year, 25 of whom study biology. What Percentage the third year girls study biology?

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

1.0

step-by-step explanation:

he answer is x=1x3 because x=1 to x=3

actually what is a question i don't understand