Nora took 8 bottles of water to a picnic. Of those bottles of water, she and her friends
opened a certain number of bottles, b. What expression can be used to determine the
number of unopened bottles at the end of the picnic?

Question

Nora took 8 bottles of water to a picnic. Of those bottles of water, she and her friends 
opened a certain number of bottles, b. What expression can be used to determine the 
number of unopened bottles at the end of the picnic?

anonymous · Answer

need help?

anonymous · Answer

You can use algebra...

Start by presuming that the number of bottles opened = X

and proceed from there

anonymous · Answer

but how?

anonymous · Answer

Total number of bottles = 8
Let the number of bottles opened = X

Then, the number of bottles left unopened = 8 - X

anonymous · Answer

Let opened bottles =x
remainig bottles =y
y=8-x