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codewars #29  Multiples of 3 or 5

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in.

Note: If the number is a multiple of both 3 and 5, only count it once.

Courtesy of ProjectEuler.net

import java.util.stream.IntStream;

public class Solution {

  public int solution(int number) {
     //TODO: Code stuff here 
    return IntStream.range(1, number).filter(x-> x%3==0 || x%5==0 ).sum();

  }
}

#24 A + B = 123

Task

Given number A you must return number B so that

(int) (A + B) == 123

Note

B can't be negative

:-)

public class Dinglemouse {
  public static long int123(final int a) {
    return Integer.toUnsignedLong(123 - a);
  }
}