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# The ratio of the heights of two boys is 7:6 . if the height of the first boy is 210 cm, what is the height of the second boy

**Given**: Ratio of heights of two boys is 7:6. Height of first boy is 210 cm

**To find**: Height of second boy

Let the height of second boy be X

So ratio of their heights is 210: X

So we have,

210: X = 7:6

Product of means = product of extremes

=>

$210\times6 = x\times7$

Divide both sides by 7

$\frac{210\times6}{7} =\frac{ x\times7}{7}$

$30\times6 = x$

$180 = x$

So, height of second boy is 180 cm

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