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to answer this question you have to know the formula of rectangle area, which is

A= a*b

A- represents area of the rectangle
a- can represents the width of the rectangle
b- can represents the length of the rectangle

Now when you know the formula you can just plug in the given informations

A=40 a=5 b=?

40=5b

Now you just need to solve for b (length), by dividing both sides of the equation by 5
which give you

b=8 and that's the length of the rectangle ;))

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Q: The area of a rectangle with width 5 is 40 what is the length?
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