Direction: A scientist is trying to find a cure for the common cold using four ingredients. He can choose from the stable chemicals A, B and C and the unstable chemicals W, X, Y and Z. In order for the formula not to explode, there must be two stable chemicals cannot be mixed because of their reaction together. Chemicals B cannot be mixed with chemicals W. Chemicals C cannot be mixed with chemicals Y. Chemicals Y cannot be mixed with chemicals Z.
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If the scientist calculated that Y is the most important chemical and must be used in the formula, which other ingredients must be a part of the cure?
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- A, B and Z
- B, C and X
- A, B and W
- A, B and X
- A, B and Z
Correct Option: D
On the basis of above given information , we can say that
Stable chemicals A, B and C and the unstable chemicals W, X, Y and Z. Chemicals cannot be mixed with another chemical - B/W, C/Y, Y/Z.
If Y is present then Z&C can't be with it.
Among 4 ingredients there must be 2 stable ingredients . So, they are A and B and only unstable is x because due to presence of B.
