
Please help to solve this. Thx.
Please help to solve this. Thx.
Alternative Solution:
Let u be the side of the square.
0.2m = 20 cm, 0.1m = 10cm
20(2u+10) + 10(3u) = 3000
40u+200+30u = 3000
70u=2800
u=40
Therefore area of rectangle = 2u x 3u = 2(40) x 3(40) = 80 x 120 = 9600 cm2
Let x be one side of the a square in cm.
(3x + 20) (2x + 10) – 3000 = 3x * 2x
6x² + 40x + 30x + 200 – 3000 = 6x²
70x = 2800
x = 40
So area of shaded rectangle = 6x² = 6 (40)² = 9600 cm² #