If 7a = 2b = 15, then 42ab =	Options:
A) 75
B) 125
C) 675
D) 1100
E) 1250

Rationale: "7 a * 2 b = 15 * 15 = 225 14 ab = 225 i . e . 42 ab = 675 answer : option c"
Answer: C