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# If the ratio of boys to girls is 12 : 5, and the total number of girls is 840. How many boys are there?

**Given:**

**
**

The ratio of boys to girls $= 12 : 5$.

**
**

The total number of girls $=840$.

**
**

**To do:**

**
**

We have to find the number of boys.

**Solution:**

**
**

Let the number of boys be $x$.

Therefore,

$12:5=x:840$

$\frac{12}{5}=\frac{x}{840}$

$x=\frac{840\times12}{5}$

$x=168\times12$

$x=2016$

**The number of boys is $2016$.**

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