Question

Instructions (Q. 46 to 48): The chart below shows six elements, numbered 1 to 6, along with their percentage share of total annual production. Each element is processed by one or more of three industries, A, B, and C, which in turn supply primary users P through W, each shown with its percentage share of total usage. The total production equals 100 percent, which equals 1,00,000 tons. Study the chart and answer the questions that follow.

Which industry or industries contribute to company S?

• A. Industry A and B only
• B. B and C only
• C. A and C only
• D. B only

Hint:

Trace the single arrow that ends at user S back to the industry it starts from.

Answer 1

The Correct Option is D

Instead of tracing forward from the industries, work backward from user S and rule out every industry that has no path to it.

1. Industry A: A's output arrows run to P, Q, and R only. None of them is S, so A does not contribute to S.
2. Industry B: Following B's output arrows shows one of them ending exactly at S, so B does contribute to S.
3. Industry C: C's arrows run to U, V, and W. None of them is S, so C does not contribute to S either.

Since A and C are ruled out and B is confirmed, B is the only industry feeding S.

Let's summarize:

• Working backward from a single user and eliminating industries with no arrow to it is a quick way to answer this kind of chart question.
• Here, B only is the industry that supplies S.

Final answer: $\boxed{\text{B only}}$