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Omni-MATH / Emilia wishes to create a basic solution with 7% hydroxide (OH) ions. She has three solutions of different bases available: 10% rubidium hydroxide (Rb(OH) ), 8% cesium hydroxide …

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Emilia wishes to create a basic solution with 7%7 \% hydroxide (OH)(\mathrm{OH}) ions. She has three solutions of different bases available: 10%10 \% rubidium hydroxide (Rb(OH)(\mathrm{Rb}(\mathrm{OH}) ), 8%8 \% cesium hydroxide (Cs(OH)(\mathrm{Cs}(\mathrm{OH}) ), and 5%5 \% francium hydroxide (Fr(OH)(\operatorname{Fr}(\mathrm{OH}) ). ( TheRb(OH)\mathrm{The} \mathrm{Rb}(\mathrm{OH}) solution has both 10%Rb10 \% \mathrm{Rb} ions and 10%OH10 \% \mathrm{OH} ions, and similar for the other solutions.) Since francium is highly radioactive, its concentration in the final solution should not exceed 2%2 \%. What is the highest possible concentration of rubidium in her solution?
Plain-text mathematical notation (without MathML)
Emilia wishes to create a basic solution with 7% hydroxide (OH) ions. She has three solutions of different bases available: 10% rubidium hydroxide (Rb(OH) ), 8% cesium hydroxide (Cs(OH) ), and 5% francium hydroxide (Fr(OH) ). ( TheRb(OH) solution has both 10%Rb ions and 10%OH ions, and similar for the other solutions.) Since francium is highly radioactive, its concentration in the final solution should not exceed 2%. What is the highest possible concentration of rubidium in her solution?
Original LaTeX notation
Emilia wishes to create a basic solution with $7 \%$ hydroxide $(\mathrm{OH})$ ions. She has three solutions of different bases available: $10 \%$ rubidium hydroxide $(\mathrm{Rb}(\mathrm{OH})$ ), $8 \%$ cesium hydroxide $(\mathrm{Cs}(\mathrm{OH})$ ), and $5 \%$ francium hydroxide $(\operatorname{Fr}(\mathrm{OH})$ ). ( $\mathrm{The} \mathrm{Rb}(\mathrm{OH})$ solution has both $10 \% \mathrm{Rb}$ ions and $10 \% \mathrm{OH}$ ions, and similar for the other solutions.) Since francium is highly radioactive, its concentration in the final solution should not exceed $2 \%$. What is the highest possible concentration of rubidium in her solution?

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