Answer B -> 2.5 Ltrs
Using the mixtures principles
So the new solution will have 30% to 50% solutions in 1:3 ratio, but the total volume is 10 Ltrs
thus 30% solution will be 2.5 Ltrs
could you elaborate on what the principles are, and work through this one step by step ?
I'll tell you the underlying concept.
let C1 be the first concentration and C2 the second.
C1=30/100 of x, where x is the relative amount of water needed
C2=50/100 of y, where y is the relative amount of water needed
thus 30/100 x * 50/100 y= 45/100 (x+y)
solving for x and y you'll find the answer.
the mechanical formula to solve mixtures problems is found here7-t26249
hope this helps