four times 42 is 168, pretty close to 140
three times 42 is 126, even closer to 140
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42 is thirty percent of 140.
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. :)
Least Common Multiple (LCM) for 42 140 is 420.
the least common multiple of 42,56, and 140 is 840.
There are many possible answers. 1 times 42 is a convenient pair of numbers.