Question

I need help solving this problem When it says use the previous population it was 3.15x10 to the 8th power

Answer 1

`\text{ 1.575}*10^(10)\text{ liters of water will be n}eeded\text{ in a day}`

Step-by-step explanation:

`\begin{gathered} \text{World population = }3.15*10^8 \\ \text{water consumption per person in a day = 50 liters} \end{gathered}`
`\begin{gathered} \text{Total water consuption for the world population = y} \\ 50\text{ liters = 1 person} \\ y\text{ = 3.15}*10^8 \\ \text{cross multiply:} \\ y(1)\text{ = 50(3.15}*10^8) \\ y\text{ = 157.5 }*10^8 \end{gathered}`
`\begin{gathered} y\text{ = 1.575 }*10^2*10^8 \\ y\text{ = 1.575}*10^(10) \\ \\ \text{ 1.575}*10^(10)\text{ liters of water will be n}eeded\text{ in a day} \end{gathered}`