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# Life Science Application: 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

**Solution:**

Given, a DNA model was built using the scale 2 cm : 0.0000001 mm.

The model of the DNA chain is 17 cm long.

We have to find the actual length of the chain.

Let the actual length of the chain = x mm

According to the question,

2 cm / 0.0000001 mm = 17 cm / x mm

x = 17 × (0.0000001/2)

= 8.5 × 0.0000001

= 0.00000085 mm

Therefore, the actual length of the chain is 0.00000085 mm.

**✦ Try This: ** A DNA model was built using the scale 4 cm : 0.0000002 mm. If the model of the DNA chain is 18 cm long, what is the length of the actual chain?

**☛ Also Check: **NCERT Solutions for Class 7 Maths Chapter 8

**NCERT Exemplar Class 7 Maths Chapter 7 Problem 117(c)**

## Life Science Application: 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

**Summary:**

A DNA model was built using the scale 2 cm : 0.0000001 mm. If the model of the DNA chain is 17 cm long, the length of the actual chain is 0.00000085 mm.

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