Discussion
Assertion (A): Two materials cannot be blended to a value outside the range between them.
Reason (R): Any mixture is a weighted average of the two component values.
Answer: B
Both are true and the reason gives the constraint: no proportion of a 22 per cent and a 34 per cent clay will reach 40 per cent, so a third material is needed whenever the target lies beyond both components. The rule sets a hard limit on what blending can achieve.
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