Mathematics · Ratio and Proportion

एक बैग में, काले टैबलेट कवर और सफेद टैबलेट कवर का अनुपात 5 : 9 है। यदि बैग में 450 सफेद टैबलेट कवर हैं, तो बैग में कितने काले टैबलेट कवर हैं?

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