a[ml], α[%] ---> a+Δ[ml], β[%]
Δ represents some water.
×β/α
α ------------------> β
×α/β
a ------------------> b=a+Δ
β =
aα
-----------
a + Δ
solving this for Δ
Δ =
a (α - β)
-----------
β
a=10[ml], α=40[%], Δ=20[ml] then
β =
10*40
----------- = 13[%]
10 + 20
a=10[ml], α=40[%], β=5[%] then
Δ =
10(40 - 5)
------------- = 70[ml]
5
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