3 days in hours - 72 , 4 dollars in dimes - 40, 8 yards in feet - 24, 2 kms in mts - 2,000, 31.5 mts in centimeters - 3150, 540 cents in nickles - 108, 7 centuries in years - 700, XIX in base ten system - 19, 6 pounds in kilograms - 2.7, 10 cups in pints - 5,

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