Number of boys and girls are 'p' and 'q' respectively. Weights of a girl and a boy are 'y' Kg and 'x' Kg respectively. The average weight (in Kg) of all boys and girls.
1
\(\;\frac{{p\; + \;q}}{{\;px\; + \;qy}}\)
2
\(\frac{{px\; + \;qy}}{{p\; + \;q}}\)
3
\(\frac{{py\; + \;qx}}{{p\; + \;q}}\)
4
\(\frac{{p\; + \;q}}{{py\; + \;qx}}\)