Celia had 30 minutes to do a three-problem quiz. She spent 9 3/4 minutes on question A and 6 1/2 minutes on question B. How much time did she have left for question C?

13 3/4 minutes

Step-by-step explanation:

the balance is found at the link

step-by-step explanation:

< 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⭐