Respuesta :
Answer: 164 straws
Step-by-step explanation:
Let’s assume that the number of straws in the box before Jacob added 137 straws was x.
After Jacob added 137 straws, the total number of straws in the box became x + 137.
When Lily added another 162 straws, the total number of straws in the box became x + 137 + 162 = x + 299.
Finally, when John added 57 more straws, the total number of straws in the box became x + 299 + 57 = x + 356.
We know that the total number of straws in the box is now 520. Therefore, we can write the following equation:
x+356=520
Solving for x, we get:
x=164
Therefore, there were 164 straws in the box at first.
Answer:
There were 164 straws in the box when we started.
Step-by-step explanation:
First add all the straws that were added into the box:
137+ 162+ 57 =
356
There are 520 straws in the box at the end, so subtract the straws that were added from the total straws to find the straws that were in the box when we started.
520 - 356
164
There were 164 straws in the box when we started.