
The given figure consists of a rectangle divided into multiple regions by diagonals and intersecting lines. To count the number of triangles:
By carefully analyzing the figure, we find:
Thus, the total number of triangles is:

Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?