A number is disible by_ if the sum of the digits in the odd places and the sum of the digits in the even places are equal or their difference is a multiple of_?
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sum of the digits in the even places are equal or their difference is a multiply of a number is disible by if the sum of the digits in the odd places .
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A cylinder and a cone have equal radii of their bases and equal heights. If their curved surface areas are in the ratio 8:5, show that the radius of each is to the height of each as 3:4.
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