Question

Choose the correct option(s).

• A. $3l÷30ml=100$
• B. $783.98cm=7.8398m$
• C. $12kg\times 100g=1.2{\text{kg}}^2$
• D. $12km=120m$

Answer 1

Answer: (A), (B), (C)

$12kg\times 100g=1.2{\text{kg}}^2$

Option A :
$3l÷30ml$
Convert liter into ml
We know,
$1l=1000ml$
$\therefore 3l=3000ml$

$3l÷30ml=\frac{3000\text{ml}}{30\text{ml}}=100$
Hence, option A is correct

Option B :
783.98 cm = 7.8398 m
Convert cm into m
We know,
$1\text{m}=100$ cm
$\therefore 7.8398\text{m}=783.98\text{cm}$
Hence, option B is correct.

Option C :
12 kg $\times$ 100g
Convert gram into kg
We know,
$1\text{kg}=1000g$
$\therefore 100\text{g}=0.1$ kg
Now, 12 kg $\times$ 100 g $=12\text{kg}\times 0.1\text{kg}=1.2{\text{kg}}^2$
Hence, option C is correct.

Option D :
12 km = 120 m
Convert km into m
As we know, $1\text{km}=1000$ m
$\therefore 12\text{km}=12,000\text{m}$
Hence, option D is incorrect.