Question 503209
Let {{{ g}}} = Ms Gandt's age now
Let {{{ b}}} = Brittney's age now 
given:
(1) {{{ g = b + 24 }}}
(2) {{{ g + 3 + b + 3 = 68 }}}
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(2) {{{ g + b = 62 }}}
(1) {{{ g - b = 24 }}}
Add the equations
{{{ 2g = 86 }}}
{{{ g = 43 }}}
and, since
(1) {{{ g - b = 24 }}}
(1) {{{ 43 - b = 24 }}}
(1) {{{ b = 43 - 24 }}}
(1) {{{ b = 19 }}}
43 is Ms Gandt's age now
19 is Brittney's age now