Question 540464
let the total capacity of vessel be x

Now it is x/4 full

7 liters are added

x/4 +7

x/4 +7 = 3x/5

x/4-3x/5 = -7

LCD = 20

Multiply equation by LCD

5x-12x=20*-7
-7x=-140
/-7
x=20 

the full capacity is 20 liters


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