What percent/fraction of the picture is to be colored green, if it has two and half times the colored boxes in the picture?
Total number of boxes in the picture=100
Total number of boxes colored in the present picture=8
Total number of boxes to be colored green, if it is two and half times the present colored picture=2.5×8 = 20
Therefore, percent of the picture to be colored green=20100×100 = 20%
Or, in fraction, 20100 = 15