The number 145 is divided into two parts, a and b, such that a : b = 2 : 3. Also, a : c = c : b and c > 0. Find the value of c, correct to the nearest integer.

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)?