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If 87 + 92 = 18; 57 + 83 =13; 12 + 61 = 4 then 62 + 31 = ?

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If 87 + 92 = 18; 57 + 83 =13; 12 + 61 = 4 then 62 + 31 = ?
posted Sep 29, 2016 by Pushpak Chauhan

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1 Answer

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87 + 92 = 18; ((8+7)+(9-2)-4)
57 + 83 =13; ((5+7)+(8-3)-4)
12 + 61 = 4; ((1+2)+(6-1)-4)
therefore
62 + 31 = ? ((6+2)+(3-1)-4) = 6

answer Sep 29, 2016 by Smriti
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