दिया गया है कि a : (b + c) = 3 : 5, b : (a + c) = 5 : 7 और a + b + c = k है। यदि c = 540 है, तो k का मान क्या है?

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)?