Christopher has $15 in his savings account. He wants to buy a guitar. He plans to save $10 a week. Prices for guitars at The Music Shoppe start at $130.
Which number line shows how long Christopher will have to save to buy a guitar from The Music Shoppe?
A.
B.
C.
D.
We don't have the images for the number lines, but we can figure out the answer using the given information:
Christopher starts with $15 and wants to save $130. To find out how much more he needs to save, we can subtract his current savings from the cost of a guitar: $130 - $15 = $115 more to save.
He plans to save $10 a week, so to find out how many weeks it will take, we can divide the remaining amount by his weekly savings: $115 ÷ $10 = 11.5 weeks.
However, he cannot save for half a week, so he will need to save for a full 12 weeks in order to have enough money to buy the guitar.
The correct number line would show Christopher needing to save for 12 weeks.