In a binary system of A and B a liquid of 20% A (80% B)

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In a binary system of A and B a liquid of 20% A (80% B) is coexisting with a solid of 70% A(30%B). For an overall composition having 40% A the fraction of solid is

1. 0.40
2. 0.50
3. 0.60
4. 0.75

Correct Option: A

C_o = 40%
C_l = 20%
C_s = 70%

m_s =	C_o - C_l	=	40 - 20	=	20	= 0.4
	C_s - C_l		70 - 20		50