₹5,177 is divided among A, B and C in such a way that if ₹72, ₹21 and ₹24 be deducted from their respective shares, they have money in the ratio 3 : 13 : 7. Find the difference between the original shares of B and C.

If all the girls in school B and school C participated in the function, find the ratio between the number of boys in school B and school C who participated in the function.

Which of the following examples represents an inverse proportional relationship (reverse movement)?