If a, b and c are positive numbers such that (a2 + b2) : (b2 + c2) : (c2 + a2) = 34 : 61 : 45, then what is the ratio (b – a) : (c – b) : (c – a)?

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)?