Cual es el MCM de 72 y 24

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

Which polygon is she in the process of constructing ?

Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.