Field length 80m, width 50m. 5/8 of the plot is sown with sage. How many m2 of area is sown with sage.

Let us determine the area of a rectangular field, the opposite measurements of which are equal, provided that its length is 80 m and width = 50 m, according to the formula:
S = a * b = 80 * 50 = 4000 m².
Let us find what the area sown with sage is equal to, if it is 5/8 of the total area.
In order to find a part of an integer value, you must divide it by the denominator of the fraction and multiply by its numerator:
4000: 8 * 5 = 500 * 5 = 250 m².