Respuesta :

Americ
L= total wall length
w= D & E bookcase widths in inches

L= (A + B + C) - (D + E)
plug in known information

500= (200 + 75 + 125) - (w + w)
add inside parentheses

500= 400 + 2w
subtract 400 from both sides (inverse operation)

100= 2w
divide both sides by 2

50= w


ANSWER: Bookcases D and E will be 50 inches each.

Hops this helps! :)

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