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find the ratio of  450 gm to 1kg
                        45 boys to 40 girls

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Rhyckayenviz
First convert 1 kg to grams, which is 1000 grams. The ratio now would be "450:1000", simplifying, the answer is " 9:20 ". Next, 45 boys to 40 girls is "45:40", simplifying, the answer would be "9:8".