Question 1113027
Let {{{ x }}} = her age now
{{{ x + 7 }}} = her age in 7 yrs
{{{ x - 11 }}} = her age 11 yrs ago
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{{{ x + 7 = 3*( x - 11 ) }}}
{{{ x + 7 = 3x - 33 }}}
{{{ 2x = 40 }}}
{{{ x = 20 }}}
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She is 20 yrs old
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check:
{{{ 20 + 7 = 3*( 20 - 11 ) }}}
{{{ 27 = 3*9 }}}
{{{ 27 = 27 }}}
OK