The perimeter of a rectangle is equal to 40 cm to what the area of this rectangle if its length more than width by 3 times is equal? by 9 times? NE UROVNENIE

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Length - 3rd width - x perimeter - 40 1) (x the +3rd) *2 = 40 4kh*2 = 40 of the 8th =40 x =40:8 x = 5 cm - width 2) 5*3 = 15 cm - length 3) 5*15 = 75 sq.cm. - the area length - the 9th width - x perimeter - 40 1) (x the +9th) *2=40 10kh*2=40 the 20th =40 x =40:20 x = 2 cm - width 2) 2*9 = 18 cm - length 3) 2*18 = 36 sq.cm. - the area
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