Discussion

Explanation:

The diet should contain 10% minerals. P contains no minerals.
∴ P cannot be a part of any mixture.
R and S both contain 5% minerals.
∴ Mix of R and S in any proportion cannot give 10% minerals.
Consider O and R in the proportion x:y
∴ 10x + 5y = 10(x + y)
∴ 5y = 10y, which is not possible.
Similarly, Q and S, O and S, and Q and R are not possible.
Similarly a mix of three ingredients is not possible.

∴ The only possible mix is that of O and Q in equal proportion.

Hence, option (a).

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