Question 1158169
Let Juan's age = {{{ x }}}
Maria's age = {{{ 2x + 4 }}}
{{{ x - 3 }}} = Juan's age 3 yrs ago
{{{ 2x + 4 - 3 }}} = Maria's age 3 yrs ago
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given:
{{{ ( x - 3 ) + ( 2x + 4 - 3 ) = 10 }}}
{{{ 3x + 4 - 6 = 10 }}}
{{{ 3x - 2 = 10 }}}
{{{ 3x = 12 }}}
{{{ x = 4 }}}
and
{{{ 2x + 4 = 2*4 + 4 }}}
{{{ 2x + 4 = 12 }}}
Maria is 12 now
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check:
{{{ ( x - 3 ) + ( 2x + 4 - 3 ) = 10 }}}
{{{ ( 4 - 3 ) + ( 2*4 + 4 - 3 ) = 10 }}}
{{{ 1 + ( 8 + 1 ) = 10 }}}
{{{ 1 + 9 = 10 }}}
{{{ 10 = 10 }}}
OK