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The ratio of boarders to day scholars at a school is 7 to 16. However, after a few new students...

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Economist GMAT

The ratio of boarders to day scholars at a school is 7 to 16. However, after a few students join the initial 560 boarders, the ratio changed to 1 to 2, respectively. If no boarders became day scholars and vice versa, and no students left the school, how many boarders joined the school?

A. 48
B. 64
C. 70
D. 80
E. 84

OA D
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