25:625::35:?
Solution
This is a question of analogy. The relationship between the numbers in the first pair (25 and 625) is that the second number is the square of the first number (25^2 = 625).
So, to find the unknown in the second pair (35 and ?), we need to square the first number in the pair.
35^2 = 1225
So, 25:625::35:1225.
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