$$25 + 15 - 5\times \frac{1}{2} of 10 - [50 \div 10 - 5]$$
Apply bodmass rule , before solve bracket
$$25 + 15 - 5\times \frac{1}{2} of 10 - [5- 5]$$
$$25 + 15 - 5\times \frac{1}{2} of 10 - 0$$
$$25 + 15 - 5\times 5 $$
$$25 + 15 - 25 $$
15
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