Ml of 75% be 10% of cc to 30% of ml ? a. 16 ml b. 43 ml c. 84 ml d. 12 ml e.

"153.84 mL" of 75% alcohol should be added. A further explanation is provided below.

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then,

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now,

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Thus the above response i.e., "option c" is correct.

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C. 153.84 mL

Step-by-step explanation:

Let's say x is the volume of 75% solution and y is the volume of 10% solution.

Sum of the volumes:

x + y = 500

Sum of the alcohol amounts:

0.75x + 0.10y = 0.30(500)

0.75x + 0.10y = 150

Solve the system of equations using either substitution or elimination.  I'll use substitution.

y = 500 - x

0.75x + 0.10 (500 - x) = 150

0.75x + 50 - 0.10x = 150

0.65x = 100

x = 153.84

You need 153.84 mL of 75% solution.

5x+2x=49

7x=49

x=7. 35 apples