1 x 400, 2 x 200, 4 x 100, 5 x 80, 8 x 50, 10 x 40, 16 x 25, 20 x 20 = 400
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0 every pound is about 3,500 calories. but 400 times 30 is 12,000 which is about 4 pounds so burning 400 pounds a day for a month will do anyone good.
2 and 5. You will need to multiply 2 four times and 5 twice.
As a percentage, 80 over 400 is equal to 20 percent (20%).
It is: 3/400 times 100 = 0.75%
400 milligrams is 0.0004 kilograms.