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If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the following will be divisible by 11 ? ?->(Show Answer!)
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1. If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the following will be divisible by 11 ?





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  • By: guest on 01 Jun 2017 05.46 pm
    By hit and trial, we put x = 5 and y = 1 so that (3x + 7y) = (3 x 5 + 7 x 1) = 22, which is divisible by 11. (4x + 6y) = ( 4 x 5 + 6 x 1) = 26, which is not divisible by 11; (x + y + 4 ) = (5 + 1 + 4) = 10, which is not divisible by 11; (9x + 4y) = (9 x 5 + 4 x 1) = 49, which is not divisible by 11; (4x - 9y) = (4 x 5 - 9 x 1) = 11, which is divisible by 11.
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