If a Ã— b = 2a - 3b + ab, then 4 Ã— 5 + 5 Ã— 4 is equal to :  Pick:  A) 31  B) 32  C) 43  D) 45  E) 26
Explanation:   4 Ã— 5 + 5 Ã— 4 = (2 Ã— 4 - 3 Ã— 5 + 4 Ã— 5) + ( 2 Ã— 5 - 3 Ã— 4 + 5 Ã— 4)   = (8 -15 + 20 + 10 - 12 +20)= 
<gadget id="calculator">(8 -15 + 20 + 10 - 12 +20)</gadget>
<output>31</output>
31.   31nswer: 31
<result>A</result>
If a Ã— b = 2a - 3b + ab, then 4 Ã— 5 + 5 Ã— 4 is equal to :