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Reading at the Beach

GMAT-QWQ1P4

Sandy is immersed in a fascinating book while lounging at the beach. She is a fast reader and finds the book so compelling that she reads it without pausing. After 12 minutes of reading, 96 pages of the book remain. After 72 minutes have elapsed, 16 pages remain. If Sandy reads the entire book at a constant rate, she will have read a total of $a$ pages in $b$ minutes.

Find $a$ and $b$. Make only two selections, one in each column.

$a$

$b$

$a$

$b$

84

$a$

$b$

96

$a$

$b$

104

$a$

$b$

112

$a$

$b$

120