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Constant rate set up and solve the proportion[edited] A website revives 330 subscription at a constant rate in 30 day . Find the number of subscriptions garnered in 20 days

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Hello!

As the exercise informs us that it has a constant rate, first we have to calculate the number of subscriptions each day. Let's do it using the formula below:


\text{ rate=}\frac{\text{ number of subscriptions}}{\text{ number of days}}

As it mentioned 330 subscriptions in 30 days, let's calculate the rate (subscriptions of each day):


\begin{gathered} \text{ rate=}\frac{330\text{ subscriptions}}{30\text{ days}} \\ \boxed{\text{ rate=11subs/day}} \end{gathered}

As we know the rate, we just have to multiply it by the number of days that we want:


\begin{gathered} 11\text{ subs/day}=\frac{x\text{ subscribers}}{20\text{ days}} \\ \\ x=20\cdot11 \\ \boxed{220\text{ subscribers in 20 days}} \end{gathered}

User David Castro
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