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16 December, 07:08

Jerry is experimenting with chemicals in the laboratory. He mixes a solution that is 10% acid with a solution that is 30% acid. How much of the 30% acid solution will be needed to make 40 liters of solution that is 25% acid?

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  1. 16 December, 07:34
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    10 litres; )

    1/10 x 3/10 = 4/100

    5/10 x 5/10 = 25/100

    1/10 x 5 = 5/10

    (3/10 divided by 3) x5 = 5/10

    5y = 5x/3

    15y = 5x < - - 20 altogether

    40 divided by 20 = 2

    2x5 = 10litres

    2x15 = 30litres

    (Sorry it's written really weirdly, I can't type anything on my phone x'D)
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