Answer :

Riia

Let x cubic cm of 10% acid is mixed with (150-x) cubic cm of 4% solution to obtain 150 cubic cm that is 6% acid .

Therefore the equation is

[tex]0.1x + 0.04(150-x) = 0.06*150 \\ 0.1x + 6 -0.04x = 9[/tex]

Combining like terms, we will get

[tex]0.06x = 3[/tex]

Dividing both sides by 0.06,

[tex]x =  \frac{3}{0.06} \\ x = 50 \ cubic \ cm[/tex]

50 cubic cm of 10% acid is mixed with

[tex](150-50)=100 \ cubic \ cm[/tex]

of 4% solution to obtain 150 cubic cm that is 6% acid .

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