81.6%
You do (40/49) x 100
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49 mg as a percentage of 100 g = 100*49mg/100 g = 49 mg/1 g 49 mg /1000 mg = 49/1000 = 0.049%
40 as a percentage of 220 = 100*40/220 = 18.1818..
35/40 as a percentage = 35/40 * 100 = 87.5%
98%
No. They are a factor pair for 40, since 8 x 5 = 40. They are not factors of 49, so they cannot be a factor pair of 49.