SOLUTION: 51 57 63 ? 75 what's the missing number of the question mark? And this one 10 ? 24 28 30 again the missing number of the question mark please

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Question 1172339: 51 57 63 ? 75 what's the missing number of the question mark?
And this one
10 ? 24 28 30 again the missing number of the question mark please
Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!
                     51  57  63  ?  75

difference:             6   6   ?  ?

Try difference of 6, and see what happens.
63, 69, 75

Missing number is 69.
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