Question

Perform the operation: $3\text{L}-825\text{mL}+2.7\text{L}$

• A. 4.875 L
• B. -819.3 mL
• C. -0.819 L

Answer 1

The correct option is A 4.875 L

As addition and subtraction are of same priority, we start from left and move towards the right.

Let's perform 3 L - 825 mL first.

To subtract two quantities, we first need to make them like terms.

We know, 1000 mL = 1 L
$\Rightarrow$ 1 mL = $\frac{1}{1000}$ L
$\Rightarrow$ 825 mL = $\frac{825}{1000}=0.825$ L

Now, let's perform the subtraction.
$\Rightarrow 3\text{L}-0.825\text{L}$
$\Rightarrow 3\text{L}-0.825\text{L}=2.175\text{L}$

We need to find: $3\text{L}-825\text{mL}+2.7\text{L}=(3\text{L}-0.825\text{L})+2.7\text{L}=2.175\text{L}+2.7\text{L}$


$\therefore 3\text{L}-825\text{mL}+2.7\text{L}=4.875\text{L}$