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Find the missing number following the same rule: 68 : 19 :: 76 : 21 :: 164 : ?

1. 45
2. 39
3. 43
4. 41

Correct answer: 43

Solution

Each first number divided by 4 gives a quotient; the paired second number is that quotient plus 2. 68/4=17, 17+2=19; 76/4=19, 19+2=21; 164/4=41, 41+2=43.

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