Hectoliters 3342

We filled the water tank from 3/5 of its volume. After releasing 21 hl, only 1/4 of the entire volume remained. How many hectoliters of water can the tank hold?

Correct answer:

x =  36 hl

Step-by-step explanation:


x = 3/5·V
x - 21 = 1/4·V

3V-5x = 0
V-4x = -84

Row 2 - 1/3 · Row 1 → Row 2
3V-5x = 0
-2.33x = -84


x = -84/-2.33333333 = 36
V = 0+5x/3 = 0+5 · 36/3 = 60

V = 60
x = 36

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