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Omni-MATH / If Alex does not sing on Saturday, then she has a 70% chance of singing on Sunday; however, to rest her voice, she never sings on both days. If Alex has a 50% chance of singing on …

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problem

If Alex does not sing on Saturday, then she has a 70%70 \% chance of singing on Sunday; however, to rest her voice, she never sings on both days. If Alex has a 50%50 \% chance of singing on Sunday, find the probability that she sings on Saturday.
Plain-text mathematical notation (without MathML)
If Alex does not sing on Saturday, then she has a 70% chance of singing on Sunday; however, to rest her voice, she never sings on both days. If Alex has a 50% chance of singing on Sunday, find the probability that she sings on Saturday.
Original LaTeX notation
If Alex does not sing on Saturday, then she has a $70 \%$ chance of singing on Sunday; however, to rest her voice, she never sings on both days. If Alex has a $50 \%$ chance of singing on Sunday, find the probability that she sings on Saturday.

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