If C + D = 15 and C and D are any numbers, which of the following is a possible value for 8C + 5D? Pick.
A) 99 B) 29 C) 0 D) 09 E) 19
c + d = 15   8c + 5d = 3c + 5C + 5d = 5(c+d) + 3C = 5(15) + 3C=75 + 3C= c=-25   Now 3C is a multiple of 3, so the right answer should be 75 + multiple of 3.   c+d=15=-25+d=15=d=40   So, 0 is the right answer   Hence, 0 is the right answer.
<result>C</result>
If C + D = 15 and C and D are any numbers, which of the following is a possible value for 8C + 5D?