In the figure above, d = 100. If a + b = 40, then a = ?

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<img alt='Image' src='https://www.fatskills.com/images3/gre/unfig13_14.jpg'><br>In the figure above, <em>d</em> = 100. If <em>a</em> + <em>b</em> = 40, then <em>a</em> = ?