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If you have 25cm and 20cm for example, you just multiply all the sides to get the area! which in this problem its 25x20=500 cm. ~Hannah G.
30% of 40 is equal to 30 X 40 / 100 = 12 25% of 20 is equal to 25 X 20 / 100 = 5 answer together is 30X40+25X20 / 100 = 17