Someone come in clutch rn

Need on this geometry question. explain how you did it.

X-10/4 when x = –18 a 7 b –2 c –7 d 2

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