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. :)
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42- you figure this out by changing the percent into a decimal and multiplying it. 0.3 x 140=42
42 is thirty percent of 140.
42/30 = 1.4 = 140 %
140 = 14,000 percent
four times 42 is 168, pretty close to 140 three times 42 is 126, even closer to 140