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14 votes
14 votes
Marie is saving money to buy a prom dress that costs 225$. She already has 85$ and makes 20$ per day. Babysitting after school . Write & solve an inequality to determine how many days marie need to babysit in order to have enough money for the dress.

User Tdgtyugdyugdrugdr
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1 Answer

21 votes
21 votes

Given,

Total money needed = 225

Money already Marie has = 85

Marie per day Income = 20

Let it take x days for Marie to have enough money to buy the prom dress.

We can say:

Total Money = Money Marie already has + per day income

Using the given information, we can craft an inequality shown below:


85+20x\geq225

This means "85 already have plus 20 per day will need to be atleast 225".

Now, we can do algebra and solve for x. Steps are shown below:


\begin{gathered} 85+20x\geq225 \\ 20x\geq225-85 \\ 20x\geq140 \\ x\geq(140)/(20) \\ x\geq7 \end{gathered}

Thus, Marie needs 7 days more to have enough money to buy the prom dress.

User Chris Johnsen
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