15. The extension in an elastic string varies directly as the weight hung on it. If a weight of 150 g produces an extension of 2.8 cm, what weight would produce an extension of 19.6 cm?
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19.6÷2.8=7 cm
2.8 cm produces 150 grams elastic
then what weight will produce 19.6 cm = 150×7 =105
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