Question 1004907
Let {{{ x }}} = liters of oil to be added
{{{ .03*120 = 3.6 }}}
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{{{ ( x + 3.6 )/( x + 120 ) = .1 }}}
{{{ x + 3.6 = .1*( x + 120 ) }}}
{{{ x + 3.6 = .1x + 12 }}}
{{{ .9x = 8.4 }}}
{{{ x = 9.333 }}}
9 and 1/3 liters of oil should be added
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check:
{{{ ( x + 3.6 )/( x + 120 ) = .1 }}}
{{{ ( 9.333 + 3.6 )/( 9.333 + 120 ) = .1 }}}
{{{ 12.933 / 129.333 = .1 }}}
{{{ 12.933 = 12.933 }}}
OK