**Concept: The question tests on basic reasoning skills of Arithmetic**

**Solution:**

**St(1):-**a/b <0.818

You "know" that you can convert 9/11 into a decimal and "decide/judge" if a/b is less or more than that based on the information that a/b is less than 0.818.You do not need to calculate.)

**Sufficient****S(2):-**b/a >1.223

=>a/b < .817 (Taking reciprocal. You "know" you can get the reciprocal and hence you have to decide that

__the____If a and b are positive integers,____value of 0.817 "can" be calculated and you do not need to calculate it actually__) Hence now when you know that a/b <0.817 ,you can decide and answer if it is less than 9/11.

**(Sufficient)**