x, y, a, and b are positive integers. When x is divided by y, the remainder is 6. When a is divided by b, the remainder is 18. Which of the following is NOT a possible value for y + b? Choose the correct choice from the following choices:
A) 24  B) 21  C) 20  D) 17  E) 15
Important note: remainder is ALWAYS less than divisor, thus y&gt;6 and b&gt;18 --&gt; y+b&gt;24.   24nswer: 24.
<result>A</result>
x, y, a, and b are positive integers. When x is divided by y, the remainder is 6. When a is divided by b, the remainder is 18. Which of the following is NOT a possible value for y + b?