The ratio of the total number of students scoring less than 60% marks to that of scoring exactly 60% marks is

The number of students scoring more than 60% marks in school A = $$\frac{55}{100}\times800=440$$

Thus, students scoring exactly 60% marks in school A = $$800-440-320=40$$

Similarly, for other schools :

Total number of students scoring less than 60% marks = 320+220+300+280+210 = 1330

Total number of students scoring exactly 60% marks = 40+20+35+15 = 110

$$\therefore$$ Required ratio = $$\frac{1330}{110}=133:11$$

=> Ans - (B)