4200
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well, if you take 42/140 and make it equal to x/100, you can cross-multiply. After doing that, you get the equation 4200=140x. Divide each side by 140, and you get x=30. Now you know that 42 is 30% of 140. :)
42- you figure this out by changing the percent into a decimal and multiplying it. 0.3 x 140=42
(12/30) x (11/56) =(12 x 11)/(30 x 56) =132/1,680 =11/140
140 = 1 x 140.......... 2 x 70.......... 4 x 35.......... 5 x 28.......... 7 x 20.......... 10 x 14
70 x 2 = 140 28 x 5 = 140 and so on.