In 8 days, the earth picks up (6.4 × 10⁷) kg of dust from the atmosphere. How much dust will it pick up in 15 days?
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8 days = 6.4×10 power 7
15 days = ?
15×6.4×10 power 7/ 8
15×0.8×10 power 7
12.0×10 power 7
12×10 power 7 kg
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