https://pad let. com/silv9505/fruimql7bj9ssess took me a lot of times to try to fix it but here i guess i dont know if i did the link right either

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters