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200 x 20% = 200 x 0.20 = 40
0.4 x 200 = 0.4 x 10 x 20 = 4 x 20 = 80
10. Let us assume x is the number. x * (20/100) = 2 x * 20 = 200 x = 200/20 = 10 2 is 20% of 10.
first, convert everything to cm: 200 cm x 200 cm x 20 cm (m = 100 cm, dm = 10 cm) then: 200 x 200 x 20 = 800,000 cm3 (or 800 dm3 or 0.8 m3)
200/20 = 10 x 15 = 150