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January 31, 2015

January 31, 2015

Posted by **danielle** on Tuesday, August 23, 2005 at 1:13pm.

Austin has 42 paperback books that are either Mysteries or science fiction. If he has 16 more Mysteries than science fiction books, how many mysteries does he have?

Let x be the number of mysteries. Then there will be x - 16 science fiction books.

Write

x + (x -16) = 2x - 16 = 42

which reduces to

2x = 58

Solve for x.

i dont know how you got that but i talked to a real tutor and 2x doesnt equal 58 it equals 26

youre right danielle; drwls made a slight mistake in his algebra; check the solution that i posted

M = MYSTERY BOOKS

S = SCIENCE BOOKS

M - 16 = S because he was 16 more mysteries than scifis.

M + S = 42 because he has a total of 42 mysteries and scifis

M + S = 42

M - 16 = S

M + (M - 16) = 42

M + M - 16 = 42

2M - 16 = 42

2M = 26

M = 13

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