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Biomedical Engineer

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Real-Life Math -- Solution

You're doing some quick math to discover if a newly designed artificial heart can pump enough blood. First, figure out how often it beats in a day. If the heart beats every three seconds, that's 20 times per minute:

20 x 60 minutes per hour = 1,200 times per hour
1,200 x 24 hours per day = 28,800 beats per day

Now you want to multiply that by how much blood it pumps:

28,800 beats per day x 1.5 ml per beat = 43,200
43,200 / 1,000 = 43.2 liters

Your artificial heart can pump enough blood -- the average human heart pumps between 40 and 50 liters a day. You can refine the design later, but at least you're on target.

"The basis of all engineering fields is mathematics, which is one of the reasons that our pre-employment screening test includes almost an hour of math problems," says Tatiana With, a manager of biomedical hardware research. "Every engineer in our company carries a calculator everywhere he or she goes!"


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