The product of a and b is equal to 12 more than twice the sum of a and b. If b = 10, what is the value of b - a? Choose the correct choice
A) 2 B) 5 C) 7 D) 6 E) 35

Rationale: ab = 12 + 2 ( a + b ) 10 a = 12 + 2 a + 20 8 a = 32 a = 4 b - a = 10 - 4 = 6 d is the answer
Answer: D