Concept:
- Rather than multiplying first, each state can be divided by the value for Q to see directly how many times larger it is.
- Working in ratios also guards against picking a state that is simply the largest instead of the one that is nearly three times.
Step 1: Note the base value.
State Q has an IMR of $7$. Every other value will be divided by this number.
Step 2: Divide each state by 7.
For P, $\dfrac{32}{7} \approx 4.6$
For R, $\dfrac{30}{7} \approx 4.3$
For S, $\dfrac{20}{7} \approx 2.9$
Step 3: Pick the ratio nearest to three.
The ratios for P and R are both above four, so neither is close to three. The ratio for S is about $2.9$, which is almost exactly three.
Step 4: Rule out the trap in option (A).
Option (A) names Q itself, whose ratio with itself is one. It is placed there for a student who reads the question in a hurry, since the state being compared cannot be the answer.
Step 5: Note the extra columns.
The literacy rate and the net attendance ratio are given as additional information about development but play no part in this particular calculation.
Final Answer: (C) S