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Mathematics, 27.03.2020 21:00 Ddom

Mathew mowed lawns for 3 hours and earned $6.20 per hour. Then he washed windows for 4 hours and earned $6.90 per hour. What were Mathews average earning per hour for all 7 hours?

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Mathew mowed lawns for 3 hours and earned $6.20 per hour. Then he washed windows for 4 hours and ear...
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