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Marta was pregnant 268 days, 258 days, and 270 days for her first three pregnancies....

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Marta was pregnant 268 days, 258 days, and 270 days for her first three pregnancies. In order for Marta's average pregnancy to equal the worldwide average of 266 days, for how long must her fourth pregnancy last?In order to equal the worldwide average of 266 days, Marta's fourth pregnancy must last for days.

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