Explanation:

- To find the other number, y, we can use the relationship between LCM, HCF, and the two numbers: $$\text{LCM}(x,y)\times \text{HCF}(x,y)=x\times y$$.

- Here, LCM is 441, HCF is 7, and x is 49.

- Using the formula: $$441\times 7=49\times y$$

- Simplifying gives: $$y=\frac{441\times 7}{49}$$

- Calculating this: $$y=\frac{3087}{49}=63$$

?? Correct Answer: Option 4 - 63

- Therefore, the correct answer is option 4.