Analytical Reasoning Question No. 115
Samples of a yellow feed grain must be tested for contamination by one or more of the toxins: R, S, and T. A sample retains the color it acquires from a test unless another test changes the color of the sample.
- Test X: Turns a sample green if the sample contains R or S, or both, and orange if it contains neither R nor S.
- Test Z: Turns a sample purple if the sample contains T; if not, the sample retains the color it had prior to test Z.
1. A sample that contains R and S but not T will yield which of the following sequences of colors, the first after test X is used and the second after test Z is used?
A. Green, green. B. Green, purple. C. Orange, yellow.
D. Orange, orange. E. Orange, purple.
2. A sample that remains yellow when subjected to test Z and turns green when subjected to test X could be a sample containing:
A. R, S, and T
B. S and T, but not containing R
C. T, but containing neither R nor S
D. S, but containing neither R nor T
E. Neither R nor S nor T
3. The two tests will NOT distinguish between two samples containing which of the following?
| Option | Sample 1 | Sample 2 |
|---|---|---|
| A | R, S, and T | R and S, but not T |
| B | R and S, but not T | S and T, but not R |
| C | R and T, but not S | S and T, but not R |
| D | R, but neither S nor T | Neither R nor S nor T |
| E | S, but neither R nor T | Neither R nor S nor T |
