Question

Stones weighing are helpful in weighing 3 kg of firewood.

• A. 4 kg and 2 kg
• B. 5 kg and 1 kg
• C. 5 kg and 2 kg

Answer 1

The correct option is C 5 kg and 2 kg

We can use stones weighing 5 kg and 2 kg to weigh 3 kg of firewood.

Let's see.
If we place 5 kg of stone in the left pan

and 3 kg of firewood on the right pan,

the balance will tilt towards the heavier side,

that is, towards the left side. Because 5 > 3.

So, in order to balance, we will put

another 2 kg stone weight along with the

3 kg firewood on the right pan.

Now, in the right pan we have,

$3\text{kg}+2\text{kg}=5\text{kg}.$

Hence, we will have 5 kg weight on

both the pans which will balance the scale.

In this way, we can measure the weight

of 3 kg firewood using the stones of the given weight.