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    Thank you.
    Please show the steps.

    contents of the original mix (kg)
    sand: 15 x 1/3
    coir: 15 x 2/3
    Well you can't take any coir out so you're stuck with 10 kg of coir and you want that 10 kg to be 40% of your final mix

    if 10 kg is 40% then 1 kg is 4%

    the target amount of sand in the final mix is 60/4 (kg)
    i.e 15 kg

    how much new sand do you have to add to the amount of sand already in the original mix until it's got 15 kg of sand in it?
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