10 cm^3 of a normal specimen of human blood contains 1.2 g of hemoglobin. How many grams does 37 cm^3 of the same blood contain?
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$\displaystyle \frac{37}{10}= 3.7$ so a 37 cm^3 sample is 3.7 times a large as a 10 cm^3 sample and contains 3.7 times as much hemoglobin.
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