Direction (Q. 1-5) : Read the information below and answer the questions that follow:
880 students appeared in an examination. Of these, 224 passed in Physics, 240 passed in Chemistry and 336 passed in Mathematics, 64 passed in both Chemistry and Mathematics, 80 passed in both Physics and Mathematics, 40 passed in both Physics and Chemistry, and 24 passed in all the three subjects.

The percentage of students who didn't pass in any of the subjects is

The ratio of the earnings of A to B is 5 : 8. If the earnings of A increases by 25% and that of B decreases by 25%, what is the new ratio of their earnings ?

A can do a piece of work in 15 days and B in 20 days. How much time will they take to complete the work if they work on alternate days, starting with A ?

A silver wire, when bent in the term of a square, encloses an area of 625 cm^{2}. How much area would the same wire include if it is bent to form a circle ?