Find the whole from a given percentage of it

This type of question, asked 2 times: 17 Sep 2025 S1, 23 Sep 2025 S1. All 2 questions below, oldest first.

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Question 1
17 Sep 2025 S1
19 $If 25% of a certain number is 15, what is that number?$
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Question 2
23 Sep 2025 S1
20 $A person spends 80% of his income and saves ₹2000. What is his income?$
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