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This problem trains for: SAT-I, GMAT, AMC-8, AMC-10, Math Kangaroo 5-6, Math Kangaroo 7-8.

Jack London wrote 'Moon Face' in 68 days. Had he written one extra page per day, he would have written the novel in only 51 days. How many pages does the novel have?

Let us denote the number of pages of the novel with x.

The rate (number of pages per day) he wrote at is:

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Had he written one extra page per day, his rate of writing would have been:

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which is larger than the slower rate by 1 page per day:

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Solving for x we find the number of pages:

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