How much 60% solution and how much 35% solution is needed to create 100 l of 40% solution?

Correct result:

60% =  20 l
35% =  80 l


a+b=100 a(60/100)+b(35/100)=100(40/100)  a+b=100 a60+b35=10040  a+b=100 60a+35b=4000  b=100a 60a+35(100a)=4000 60a+350035a=4000 a=(40003500)/(6035)  a=20 l
b=100a=80 l

a+b = 100

a+b = 100
60a+35b = 4000

a = 20
b = 80

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