Problem 11 asks to find the missing value in a table. Rows 1 and 2 show pairs of numbers and their sums. Row 1: 15 and 5 (sum 20). Row 2: 7 and 3 (sum 10). What is the missing value in Row 3 if the pa

Let's solve these problems by identifying the pattern for each table.

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Let's analyze the relationship between the numbers in each row.
Row 1: 15 and 5. Their sum is $15 + 5 = 20$.
Row 2: 7 and 3. Their sum is $7 + 3 = 10$.
The sum of the numbers in each row is halved from the previous row ($20 \div 2 = 10$).
Following this pattern, the sum for the third row should be $10 \div 2 = 5$.
Let the missing value be $X$.

$$X + 2 = 5$$ $$$$