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A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) = ? ?->(Show Answer!)
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1. A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) = ?





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  • By: guest on 01 Jun 2017 05.46 pm
    4 a 3 | 9 8 4 } ==> a + 8 = b ==> b - a = 8 13 b 7 | Also, 13 b7 is divisible by 11      (7 + 3) - (b + 1) = (9 - b)   (9 - b) = 0   b = 9 (b = 9 and a = 1)     (a + b) = 10.
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