Q: What is the missing number 15 35 23 31 31 - 39?

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17, 19, 23, 29, and 31

(5/31) / (15/23) = (5/31)*(23/15) = (5*23)/(31*15) = (1*23)/(31/3) = 23/93

47

19 You can do this on google by entering (15+23+31+15+11)/5

17, 19, 23, 29, and 31

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17, 19, 23, 29, and 31

(5/31) / (15/23) = (5/31)*(23/15) = (5*23)/(31*15) = (1*23)/(31/3) = 23/93

47

I think that each number is the previous one plus 8; 7+8=15 15+8=23 23+8=31 31+8=39 39+8=47

19 You can do this on google by entering (15+23+31+15+11)/5

5/31 ÷ 15/23 = 23/93

17, 19, 23, 29, and 31

7

5/31 ÷ 15/23 = 23/93

31

35- 4= 31-4= 27-4= 23-4= 19-4= 15-4= 11-4= 7,3,-1....

17, 23 and 31 are prime. 39 is not.