Least common demonstrator of 2/3 and 1/4

12

Step-by-step explanation:

Least common multiples of 3, 6, 9, 12,

Least common multiples of 4, 8, 12

If you want me to work out the equation comment under my answer  

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< 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

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