Total number of products sold by shop A on Monday is twice the total products sold by shop E on the same day. The total products sold by shop A over three days is 350. Find the ratio of total products sold by shop C to shop D on Wednesday.

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**Solution:**

1. Given that the total products sold by shop A on Monday is twice the total products sold by shop E on Monday.

2. Total products sold by shop A over three days = 350.

3. From the data, total products sold by A on Tuesday = 100 (calculated as $ \frac{25}{2} \times 8 = 100 $) and on Wednesday = 70 (since 350 - 100 - 180 = 70).

4. Percentage of products sold by A on Wednesday is:
   $$ y\% = \frac{70}{350} \times 100 = 20\% $$

5. Total products sold by D on Wednesday is given by:
   $$ 120 \times (y - 5)\% = 120 \times 15\% = 18 $$

6. Total products sold by C on Wednesday is:
   $$ 80 \times 45\% = 36 $$

7. Therefore, the required ratio of products sold by C to D on Wednesday is:
   $$ 36 : 18 = 2 : 1 $$

**Answer:** 2 : 1

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