Let the total amount of food be \(7u\) (fresh \(5u\), frozen \(2u\)).<br><br>
&bull; Fresh vegetables = \(\frac{7}{7+3} \times 5u = \frac{7}{10} \times 5u = 3.5u\).<br>
&bull; Frozen vegetables = \(\frac{1}{1+3} \times 2u = \frac{1}{4} \times 2u = 0.5u\).<br>
&bull; Total vegetables = \(3.5u + 0.5u = 4u\).<br>
&bull; Ratio of vegetables to all food = \(4u : 7u = 4 : 7\).<br><br>
Final Answer: 4 : 7