Question

In a survey of 300 adults, 15% didnot know how to ride a bike. Howmany people is this?ble problem?

Answer 1

To determine how many people out of the 300 surveyed did not know how to ride a bike, you have to calculate the 15% of 300.

You can use cross multiplication to do so:

100%____300 people

15%_____x people

Both relations have to be at the same ratio so that

$\frac{300}{100}=\frac{x}{15}$

Multiply both sides by 15 to determine the value of x:

$\begin{gathered} 15\cdot\frac{300}{100}=15\cdot\frac{x}{15} \\ 45=x \end{gathered}$

This means that out of the 300 people surveyed, 45 did not know how to ride a bike.