Jina is saving money and already has $45 saved. She is going to save an additional $18 each week for x weeks. This will give her enough money for a bike that costs $117. By solving an equation, we find that she needs to save for 4 weeks.
Step-by-step explanation:
The correct answer is:
Jina is saving money and already has $45 saved. She is going to save an additional $18 each week for x weeks. This will give her enough money for a bike that costs $117.
By subtracting the cost of the bike ($45) from the amount she has left in her savings ($117), we can find out how much money she needs to save: $117 - $45 = $72.
Let's set up an equation to solve for x, the number of weeks she needs to save:
$18 * x = $72
To solve for x, we divide both sides of the equation by $18:
x = $72 / $18 = 4
So Jina needs to save for 4 weeks to have enough money for the bike.