Question

freinds tell answer plz ​

Answer 1

in solution 4 because you see volume of ink is just 50 but the volume of water is 250

there is a difference of 200 between them

in solution 1 the difference is 175

in solution 2 the difference is 90

in solution 3 the difference is 35

and in solution 4 the difference is of 200

so the concentration with the lightest blue color is in solution 4