38
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5 and 47, 9 and 43, 11 and 41, 23 and 29.
9 29/40 : resolve the fraction by dividing 29 by 40 = 0.725, then add to whole number, so 9 + 0.725 = 9.725
17+5+4
3, 7 and 9. 4 odd digits that add up to 19 would be 9, 9, 0.5, 0.5
The divisibility test for the number 9 is: Any number whose digits add up to 9 or a multiple of 9, is divisible by 9. Any other number the sum of whose digits do not add up to 9 or a multiple of 9, are not divisible by 9.For example, the digits of 81 sum up to 9, and therefore, 81 is divisible by 9. The digits of the number 319381482 add up to 39, and therefore, 319381482 is divisible by 9.