Quantitative Aptitude Quest
Number Systems
If r + x + y + z = 12 and x is less than 6, then at lest k of the numbers r,x,y, and z must be positive, where k is
1. 0
2. 1
3. 2
4. 3
Since 12 is positive, one of the numbers must be positive because the sum of negative number is negative. If r is 13, then x = 0, y = -1, and z = 0, satisfy r + x + y + w= 2 and x < 6.