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The binary phase diagram of metals $P$ and $Q$ is shown in the figure. An alloy $X$ containing $60 \% P$ and $40 \% Q$ (by weight) is cooled from liquid to solid state. The fractions of solid and liquid (in weight percent) at $1250^o C$, respectively, will be

  1. $77.8 \% \text{ and } 22.2 \%$
  2. $22.2 \% \text{ and } 77.8 \%$
  3. $68.0 \% \text{ and } 38.0 \%$
  4. $32.0 \% \text{ and } 68.0 \%$ 
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