Question

A tank can hold 50 litres of water. At present, it is only 30% full. How many litres of water is required to fill 50% of the tank ?

Answer 1

Step-by-step explanation:

Volume = 50L

At present, tank contain 30℅ water so let we assume that water be x.

(x/50)×100 = 30%

2x = 30

x = 30/2 = 15L

30% water = 30L is present

We need 50%

When tank contain 50% water so let we assume that water be y.

(y/50)× 100 = 50%

2y = 50

y= 50/2 = 25L

50% water = 25L

20% water = 50% - 30%

20% water = 25L - 15L

20% water = 10L

Answer 2

Answer:

10 litre

Step-by-step explanation:

full capacity off the tank=50 litre

100%=50 litre

given:

30% is full at present

to find litre of water,

we need to apply unitary method.

by the problem

30=50/100 litre

15 litre

a tank can hold 50 l of water

therefore its half=25 l

therefore l of extra  water required= 25-15= 10 litre