Question

Find the total weight 4 dumbells if one dumbell weighs 800 grams.

• A. 4 kg
• B. 0.32 kg
• C. 32 kg
• D. 3.2 kg

Answer 1

The correct option is D

3.2 kg

$\text{Weight of 1 dumbbell}=800\text{g}$$\Rightarrow \text{Weight of 4 dumbbells}=800\text{g}\times 4$
$=3200\text{g}$

Since the options are in kilograms, we need to convert 3200 g to kg.

When we convert a smaller unit (g) to a larger unit (kg), we divide the given measure by the conversion factor.

$1\text{kg}=1000\text{g}$
$\Rightarrow 3200\text{g}=\frac{3200}{1000}\text{kg}$
$=3.2\text{kg}$

Thus, the weight of 4 dumbbells is 3.2 kg.