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The pyramid puzzle you provided follows a logical pattern where each block is the sum of the two blocks directly beneath it. Here's how we can determine the missing number:

1. At the bottom row, we have the numbers: \( 1, 3, 5, 2 \).
2. Moving up to the next row:
   - \( 1 + 3 = 4 \),
   - \( 3 + 5 = 8 \),
   - \( 5 + 2 = 7 \).

So the second row from the bottom is \( 4, 8, 7 \).

3. Moving to the next row:
   - \( 4 + 8 = 12 \),
   - \( 8 + 7 = 15 \).

This gives the next row as \( 12, 15 \).

4. Finally, the top block will be:
   - \( 12 + 15 = 27 \).

Thus, the missing number is **27**.

Would you like more details or have any further questions?

Here are five related questions for deeper understanding:
1. What would happen if we changed the numbers in the base row?
2. Could this puzzle be solved using multiplication or a different rule?
3. How does this pyramid pattern apply to other types of number sequences?
4. Can you find any other types of puzzles that use a similar summation concept?
5. How would this pattern change if we introduced negative numbers?

**Tip:** Always look for patterns in puzzles like this by examining how each number relates to those around it.

Find the missing number in the pyramid with base row 1, 3, 5, 2 and middle rows summing upwards.

Learn how to solve a pyramid number puzzle where each block is the sum of the two blocks directly beneath it. The missing top number is determined by summing numbers from the base upwards. Suitable for students in Grades 5-7.

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