(- 1 / 2 + 3 / 4 ) * 1 / 5
= ( -1 * 4 + 3 * 2 ) / 2 * 4 * 1 / 5
= (-4 + 6 ) / 8 * 1 / 5
= ( 2 ) / 8 * 1 / 5
= 2 / 8 * 1 / 5
= 1 / 4 * 1 / 5
= 1 / 20
The correct answer is 1/20
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