Question 394397
To make the solution less concentrated, water must be added.
In words:
(total salt)/(total solution) = 10%
Let {{{a}}} = liters of water to be added
given:
{{{.15*20 = 3}}} liters salt
-------------------
{{{3/(a + 20) = .1}}}
{{{3 = .1*(a + 20)}}}
{{{3 = .1a + 2}}}
{{{.1a = 1}}}
{{{a = 10}}}
10 liters of water must be added
check:
{{{3/(10 + 20) = .1}}}
{{{3/30 = .1}}}
{{{.1 = .1}}}
OK