В) 5 : 11/4+ 7 : 11/3;

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To compare the two ratios, we need to find a common denominator for the fractions. The common denominator for 4 and 3 is 12.

So, the first ratio becomes: 15/4 and the second ratio becomes: 21/3

Now, we can compare the two ratios:

15/4 : 21/3

To make the fractions have the same denominator, we can convert them to:

45/12 : 56/12

Therefore, 15/4 is less than 21/3.