A farmer saw some chickens and pigs in a field. He counted 30 heads and 84 legs. Determine exactly how many chickens and pigs he saw?

51

Step-by-step explanation:

Given parameters:

Number of heads  = 30 heads

Number of legs  = 84 legs

Unknown:

Number of chickens and pigs = ?

Solution:

Since a chicken has one head, the number of chicken is the same as the number of heads;

  Number of chicken  = 30

A pig has 4 legs,

   Number of pigs  =   = 21pigs

Total number of pigs and chickens = 30chickens + 21 pigs  = 51

10% of increase is the final answer! : )