Ben has a collection of 812 stamps. he gives his brother 345 stamps. about how many stamps ben have left?

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

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What is the average diastolic blood pressure for adults