Question

Now you show how Abdu will use these stone pieces to weigh —




(a) 4 kg of firewood




(b) 3 kg of firewood




(c) 7 kg of firewood

Answer 1

(a)



Abdu will put the firewood in one of the pans of the balance and the 6 kg stone in the other.
The pan with the stone will go down. Abdu will then put the 2 kg stone on the firewood and both the pans will become balanced.
Thus, Abdu will use 2 kg and 6 kg stones to weigh 4 kg of firewood.

(b)



Abdu will put the firewood in one of the pans of the balance and the 5 kg stone in the other.
The pan with the stone will go down. Abdu will then put the 2 kg stone on the firewood and both the pans will become balanced.
Thus, Abdu will use 2 kg and 5 kg stones to weigh 3 kg of firewood.

(c)




Abdu will put the firewood in one of the pans of the balance and the 5 kg stone in the other.
The pan with the firewood will go down. Abdu will then put the 2 kg stone in the pan with the 5 kg stone. Now, both the pans will become balanced.
Thus, Abdu will use 2 kg and 5 kg stones to weigh 7 kg of firewood.