Question

the body of a person who weighs 50 kg mg contains round 2 * 10/2 grams of sodium chloride how much sodium chloride is contained in the bodies of 1.8 * 10/3 people who each way 50kg represent the answer in scientific notation

Answer 1

We will use the ratio method to solve the question

∵ 50 kg contains 2 x 10^2 grams of sodium chloride

∵ We need to find the amount of sodium chloride in 1.8 x 10^3 people

who weigh 50 kg

At first, we must find the weight of 1.8 x 10^3 people

$\because1.8\times10^3\times50=90\times10^3=9\times10^4\operatorname{kg}$

Now we will use the ratio method

→ kg: gm

→ 50. : 2 x 10^2

→ 9 x 10^4 : m

→ By using cross multiplication

$\begin{gathered} 50\times m=9\times10^4\times2\times10^2 \\ 50m=18\times10^{4+2} \\ 50m=18\times10^6 \end{gathered}$

Divide both sides by 50 to find m

$\begin{gathered} \frac{50m}{50}=\frac{180}{50}\times10^5 \\ m=3.6\times10^5 \end{gathered}$

The answer is A