The number at the top most block in this number tower is .

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Solution

The correct option is D 51
In a number tower, the number in each block will be the sum of the numbers on the two blocks below. So let's complete the number tower.
We have 6, 7, 5 and 9 at the bottom.
6 + 7 makes 13, 7 + 5 makes 12 and
5 + 9 makes 14, thus completing the second row.
13 + 12 makes 25 and 12 + 14 makes 26, making the third row.
=> Number at the top = 25 + 26 = 51

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