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Question
A DNA model was built using the scale 2 cm : 0.0000001 mm. If the model of the DNA chain is 17 cm long, what is the length of the actual chain?
Sum
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Solution
Let the length of the actual chain be x mm.
Therefore, `(2 cm)/(0.0000001 mm) = (17 cm)/(x mm)`
⇒ `x = (17 xx 0.0000001)/2`
= 8.5 × 0.0000001
= 0.00000085 mm
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Chapter 7: Comparing Quantities - Exercise [Page 211]
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