The product of 20 and 20 is 400
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40 of 20 = 40 x 20 = 800 40% of 20 = 0.4 x 20 = 8
20 x---- = -----100 1000Cross multiply so100 * X = 20 *1000or100x = 20,000Divide by 100 on both sides to isolate the variable [x]100x = 20,000 x = 200------- ---------100 100So 20% of 1000 is 200.
25 x 20 = 500 !
20 cubed cubed = [203]3 = (20 x 20 x 20)3 This equals 20 x 20 x 20 x 20 x 20 x 20 x 20 x 20 x 20 which = (20)9 The rule to work it out is:multiply the two exponents ie 3 x 3 = 9 206 is 20 x 20 x 20 x 20 x 20 x 20 which is obviously less than 209. See: http://oakroadsystems.com/math/expolaws.htm#WhatsNew#WhatsNew
20 percent of 200 = 20/100 x 200 = 4000/100 = 40