Question

in 15 days the earth picks up 1.2 x 10^8 kg of the dust from the atmosphere in how many days the earth picks up 4.8 x 10^9 kg of dust​ plz help guys it’s important

Answer 1

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In 15 days, the earth picks up 1.2×10

8

kg of dust from the atmosphere. In how many days it will pick up 4.8×10

8

kg of dust?

Medium

Solution

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Correct option is

A

60 days

Let x be the number of days taken by the earth to pick up 4.8×10

8

kg.

Days 15 x

Dust ( in kg ) 1.2×10

8

4.8×10

8

Since, the amount of dust picked up by the earth and the number of days are in direct variation, we get:

⇒

x

15

=

4.8×10

8

1.2×10

8

⇒ x=15×

1.2

4.8

⇒ x=60

∴ The required number of days will be 60.