Watering can

A watering can full of water weighs 11 kg, the weight of water is 10 kg greater than the weight of an empty watering can, how much is the weight of the watering can?

Correct answer:

k =  0.5 kg

Step-by-step explanation:

v = 10+k

k+v = 11
k-v = -10

k = 1/2 = 0.5
v = 21/2 = 10.5

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