Watering 7078

A full watering can weigh 27kg. When half full, it weighs 15 kg. How much can an empty watering weigh?

Correct answer:

k =  3 kg

Step-by-step explanation:


k+v = 27
k + v/2 = 15

k+v = 27
2k+v = 30

Pivot: Row 1 ↔ Row 2
2k+v = 30
k+v = 27

Row 2 - 1/2 · Row 1 → Row 2
2k+v = 30
0.5v = 12


v = 12/0.5 = 24
k = 30-v/2 = 30-24/2 = 3

k = 3
v = 24

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