दो संख्याओं का अनुपात 2 : 5 है और उनका अंतर 210 है। छोटी संख्या ज्ञात कीजिए।

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)?