Find the Missing Number: If 87 + 92 = 18 Then 62 + 31 = ?

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Look at the series of equations and find the pattern in them.

Then, find the missing number in the last equation.

87 + 92 = 18

57 + 83 =13

12 + 61 = 4

62 + 31 = ?

find the missing number riddle 87 92 18

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The numbers in the equation have the following pattern;
(8+7)+(9-2)-4=18
(5+7)+(8-3)-4=13
(1+2)+(6-1)-4=4
Therefore the missing number can be found as;
(6+2)+(3-1)-4=6

Answer = 6
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