if the ratio of two number is 5:7 and LCM of the number is 320 then what is the number.	Choose the correct choice:
A) 15	B) 9	C) 10	D) 11	E) 35

Rationale: "product of two no = lcm * hcf 5 x * 7 x = 320 * x x = 9 answer : b"
Answer: B