Question 935126
Let {{{ k = 0 }}} = Kim's age in 2002 
Let {{{ f }}} = Kim's father's age in 2002
Let {{{ g }}} = Kim's grandfather's age in 2002
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(1) {{{ g = f + 25 }}}
(2) {{{ f = k + 30 }}}
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In 2002, I can say that {{{ k = 0 }}}, so
(2) {{{ f = 0 + 30 }}}
{{{ f = 30 }}} in 2002 
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Also, in 2002,
(1) {{{ g = 30 + 25 }}}
(1) {{{ g = 55 }}}
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2014 minus 2002 = {{{ 12 }}} yrs
Kim's grandfather is 
{{{ 55 + 12 = 67 }}} now