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Question

In 15 days, the earth picks up 1.2×108 kg of dust from the atmosphere. In how many days it will pick up 4.8×108 kg of dust ?

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Solution

Dust of 1.2×108 kg is picked up in 15 days
Let the dust of 4.8×108 will be picked up in x days
Therefore.
Dust (in kg)1.2×1084.8×108Days 15x
1.2×1084.8×108=4.8×108x(constant)x×1.2×108=4.8×108×15x=4.8×108×151.2×108=4×108×15108=60
Days = 60


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