1.

If the perimeter of a rectangle with dimension (2x+10) and (x+20) is 240 cm. find its dimensions

Answer»

perimeter=2(l+b)

240= 2(2x+10+x+20)

120=3x+30

3x=90

x=30.

⇒ l=2x+10=70cm

b=x+20=50cm



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