find the whole quantity if 10% of it is 900km
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https://www.meritnation.com/ask-answer/question/find-the-whole-quantity-if-40-of-it-is-800-km/comparing-quantities/10959433
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https://www.meritnation.com/ask-answer/question/find-the-whole-quantity-if-40-of-it-is-800-km/comparing-quantities/10959433
Regards