A chemist has three different acid solutions. The first acid solution contains 20 % acid, the second contains 30 % and the third contains 50 % . He wants to use all three solutions to obtain a mixture of 80 liters containing 40 % acid, using 3 times as much of the 50 % solution as the 30 % solution. How many liters of each solution should be used?

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

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step-by-step explanation:

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