Question 548873
Let the amounts = {{{a}}} and {{{b}}}
Let {{{ a + b = 1 }}} ( in some units )
given:
{{{ ( .38a + .7b ) / 1 = .4 }}}
{{{ ( .38*(b - 1) + .7b ) = .4 }}}
{{{  .38b - .38 + .7b = .4 }}}
{{{ 1.08b = .4 + .38 }}}
{{{ 1.08b = .78 }}}
{{{ b = 13/18 }}}
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{{{ 1.08b = .41 + .38 }}}
{{{ 1.08b = .79 }}}
{{{ b = 79/108 }}}
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{{{ 1.08b = .42 + .38 }}}
{{{ b = 20/27 }}}
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a/b has ratios of:
18/13, 108/79, 27/20, etc.
you can finish