Name: SAT Math Help & School Math Mastery
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#31778

polygons

geometry

medium

75 sec

A section of a library contains a total of $120$ books. There are $x$ fiction books, twice as many non-fiction books as fiction books, and $10$ fewer biographies than fiction books. There are also $30$ magazines. Which equation must be true for the value of $x$ ?

A.

$x + 2 x + (x - 10) + 30 = 120$

B.

$x + \frac{x}{2} + (x + 10) + 30 = 120$

C.

$x + 2 x + 10 x + 30 = 120$

D.

$x + 2 x + (10 - x) + 30 = 120$