In a rectangle with sides of 12 and 16 cells, 48 cells are filled in. What percentage of the area of the rectangle is painted over?

Let’s calculate the total number of cells in this rectangle:

12 * 16 = 192 cells – in total are in this rectangle.

Let’s calculate how many percent of cells are painted over, making a proportion and expressing the number of percent of painted cells in terms of f, and expressing the total number of cells in terms of one hundred percent:

192 – 100%,

48 – f.

f = 48 * 100: 192;

f = 4800: 192;

f = 25% – are filled cells of the total number of cells in the rectangle.

Answer: twenty-five percent.