The soil for house plants consists of 12% water. If someone wants to plant flowers that need 28% water in the soil, how many liters of water they need to add to 5 kg of
soil?

Given :

anna bought soil that contains 12% of water .
she wants to plant a flower that needs 18% of water .

To Find :
how much water does she need to pour in 5 kg of soil to plant the flower

Solution:

anna bought soil that contains 12% of water

5 kg of soil

=> Water = (12/100)2 = 0.6 kg

Let say Water poured = W kg or litre

Total Water = 0.6 + W kg

Total Soil = 5 + W kg

18% of water
=> (18/100)(5 + W) = 0.6 + W
=> 90 + 18W = 60 + 100W
=> 30 = 82W
=> W = 30/82
=> W = 0.366 kg or 0.366 litre
or 3.66 dl

3.66 dl water to be added