28.
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30
It is: 12
The LCD for 4/7 and 3/5 is 35.
The LCD for 1/5 and 4/15 is 15.
Of the fractions 3/10, 1/4, and 2/5, the largest is 2/5.By dividing, you can see that the decimal values are 0.3, 0.25, and 0.4.Also, using the LCD of 20, they are equal to 6/20, 5/20, and 8/20.