Answer :

If m∠B is 124°, then its supplement is 56° (180°- 124° = 56°). So, m∠B is 56°

Since ∠C is a complement of A, then C = 90° - 56° = 34°.

Therefore, m∠B + m∠C = 124° + 34° = 158°.

The answer is 158°.

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