Asian's weight increased by 25% from year 2005 to 2009. If his weight was k kilograms in 2009, what was it in 2004?
Asian's weight increased by 25% from year 2005 to 2009. If his weight was k kilograms in 2009, what was it in 2004?
Explanation
Asian's weight increased by 25% from 2005 to 2009.
This means his weight in 2009 is 125% of his weight in 2005:
Weight in 2009 = 1.25 × Weight in 2005
Given his weight in 2009 is k kilograms:
k = 1.25 × Weight in 2005
To find his weight in 2005:
Weight in 2005 = k / 1.25 = 0.8k
Since the question asks for his weight in 2004, and we don't have any information about changes in 2004:
Weight in 2004 is assumed to be the same as Weight in 2005.