Please solve the math question

\[Please\quad tell\quad me\quad the\quad solution\quad of\quad the\quad \\ following\quad question:\\ \\ In\quad \triangle ABC,\quad D\quad is\quad the\quad midpoint\quad of\quad \\ side\quad BC.\quad \angle ACB\quad =\quad { 30 }^{ \circ }.\quad \angle ADB\quad =\quad 45\\ Find\quad \angle BAD.\quad \] I know how to solve it using trigo. But tell me a different method. P.S it's an eighth class question.

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`\boxed{123}`	\( \boxed{123} \)

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Please solve the math question

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