Question

cyclohexane=1.4264 toluene=1.4967 at 20˚C
Mixture=1.4563 at 20˚C

Assuming that the relationship between refractive index and concentration is linear, calculate the composition of the mixture.

What do I do? Formula?
Let x = fraction cyclohexane and
1-x = fraction toluene
------------------
x(1.4264) + (1-x)*1.4967 = 1.4563
Solve for x and convert to percent.

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