The question asks to identify the anniversary of the Meter Convention celebrated by India's Department of Consumer Affairs on 20 May 2025.
To find the anniversary number, subtract the year the convention was signed from the year of the celebration:
Anniversary Year = Celebration Year - Convention Year
Anniversary Year = 2025 - 1875
Anniversary Year = 150
Therefore, the Department of Consumer Affairs celebrated the 150th anniversary of the Meter Convention on 20 May 2025.
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