दो संख्याओं का अंतर बड़ी संख्या का 20% है। यदि छोटी संख्या 12 है, तो बड़ी संख्या ज्ञात कीजिए।

A person saves 90% of his income. If his expenditure is ₹520, find his income (in ₹).

By how much is 30% of 60 greater than 25% of 40?

By how much is 30% of 50 greater than 35% of 30?