a student got 70% in one subject,80% in other.to get overall 75% how much he should get in third subject

a student got 70% in one subject,80% in other.to get overall
75% how much he  should get in third subject

Ques:- a student got 70% in one subject,80% in other.to get overall 75% how much he should get in third subject
2 1775

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