Question 881997
Let {{{ j }}} = Julie's age now
Let {{{ f }}} = father's age now
{{{ j + 10 }}} = Julie's age in 10 years
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given:
(1) {{{ j = (1/3)*f }}}
(2) {{{ j + 10 = 2j }}}
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(2) {{{ 2j - j = 10 }}}
{{{ j = 10 }}}
and
(1) {{{ 10 = (1/3)*f }}}
(1) {{{ f = 30 }}}
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Her father is 30 now