Question

a tank can hold 50 litres of water. at present it is only 30% full. how many litres of water shall i put in the tank so that it is 80% full.
step by step explanation ​

Answer 1

Answer:

25 litres

Step-by-step explanation:

At present, the tank is 30% full or the tank has 30% of 50 litres of water.

= $\frac{30}{100}$ x 50

= 15 litres

Now, we calculate 80% of 50 litres (the required value) = $\frac{80}{100}$ x 50

= 40 litres

Therefore the amount of water which needs to be added = 40 litres - 15 litres = 25 litres

Answer 2

Answer:

25L

Step-by-step explanation:

Amount of water that can be hold my tanker = 50L

Percent of water present in tanker = 30%

Amount of water present in tanker = 30% of 50L = 15L

Now, Amount of water needed to fill 80% of tanker = 80% of 50L = 40L

Therefore, Litres of water to be put in tank to fill to 80 % = 40L- 15L = 25L