Q10 of 54 Page 162

In 8 days, the earth picks up kg of dust from the atmosphere. How much dust will it pick up in 15 days?

More the no. of days, more will be the dust picked by the earth. So it is a direct proportion.


Let the amount of dust be x kg,


⇒ 8 × x = 15 × 6.4 × 107


⇒ x = = 12 × 107 kg = 1.2 × 108 kg


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