math
posted by Wendy
Silas took 15 bags of glass to the recycling center on Monday. He took 6 bags of plastic to the recycling center on Tuesday. Which equation could be used to find x, the total number of bags of glass and plastic Silas took to the recycling center?
A. x  15 = 6
B. x + 15 = 6
C. 15  x = 6
D. x  6 = 15

Ms. Sue
The simple way of doing this problem is to add 15 + 6.
Which of your answer choices does that? 
Wendy
I don't think any of the choices do that. is the answer A?

Ms. Sue
Yes, the answer is A.
x  15 = 6
Add 15 to both sides of the equation.
x = 21 
Wendy
thank you so much!

Ms. Sue
You are very welcome.
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