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28 times 21 equals 588.
21 pounds 12 ounces is equivalent to approximately 9.86 kilograms.
21 times 16 is 336. to find out this, here's what you do: 21 x16 ........... 126 210 you always hang a zero ........... the you add 126 and 210 together 336 this is your answer
1 foot = 12 inches Answer = (21/12) x (21/12) = 49/16 sq feet = 3.0625 sq feet
12/21/12