Question

In a cold storage, $8,000$ milk packets are kept. Each packet has $900\text{mL}$ of milk. Calculate the total quantity of milk kept in the storage in kiloliters?

• A. 7.2

Answer 1

The correct option is A 7.2
Total number of packets $=8,000$
Quantity in each packet $=900\text{mL}$

This problem can be solved by two methods.

Method 1: Since volume of each packet is $900\text{mL},$ to find the volume of all $8,000$ packets, we need to multiply $8,000$ by $900\text{mL}.$
So, the total volume of $8,000$ packets
$=8,000\times 900\text{mL}$
$=7,200,000\text{mL}$

Method 2: We can get the volume of all $8,000$ packets by adding each packet's volume $8,000$ times.

Total volume
$=900\text{mL}+900\text{mL}+900\text{mL}+\dots 8,000\text{times}$
$=7,200,000\text{mL}$

We know,
$1\text{kL}=1,000\text{L}=1000\times 1000\text{mL}$
$\Rightarrow 1\text{mL}=\frac{1}{1,000,000}\text{kL}$
$\therefore 7,200,000\text{mL}=\frac{7,200,000}{1,000,000}\text{kL}$
$=7.2\text{kL}$