If `60%` of K is 30 less than `75%` of K, then what is the value of K ?

If 60% of a number is 30, then 25% of that number is

If 40% of a number is less than its 60% by 30, then the 20% of that number is: यदि किसी संख्या का 40% उसके 60% से 30 से कम है, तो उस संख्या का 20% है:

A and B spent 60% and 75% of their incomes, respectively. If the savings of A are 20% more than that of B, then by what percentage is the income of A less than the income of B? A तथा B ने अपनी आय का क्रमशः 60% तथा 75% हिस्सा खर्च किया | यदि A की बचत B की बचत से 20% अधिक है, तो A की आय B की आय से कितना प्रतिशत कम है ?