Question

In 25 days, the earth pick up 6*10⁸pounds of dust from the atmosphere. How much dust it will pick up in 15 days.

Answer 1

Dust picked up in 25 days = 6$\times {10}^8\mathrm{pounds}$

So , Dust picked up in 1 day = $\frac{6\times {10}^8}{25}\mathrm{pounds}$
Therefore,Dust picked up in 15 days = $\frac{6\times {10}^8}{25}\times 15\mathrm{pounds}=3.6\times {10}^7\mathrm{pounds}$