Question 987883
Let {{{ t }}} = Trey's age now
Let {{{ h }}} = Heather's age now
{{{ t - 3 }}} = Trey's age 3 yrs ago
{{{ h - 3 }}} = Heather's age 3 yrs ago
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(1) {{{ t = h - 40 }}}
(2) {{{ h - 3 = 3*( t - 3 ) }}}
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(2) {{{ h - 3 = 3t - 9 }}}
(2) {{{ 3t - h = 6 }}}
and
(1) {{{ -t + h = 40 }}}
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Add (1) and (2)
{{{ 2t = 46 }}}
{{{ t = 23 }}}
Trey is 23 now
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check:
(1) {{{ t = h - 40 }}}
(1) {{{ 23 = h - 40 }}}
(1) {{{ h = 63 }}}
and
(2) {{{ h - 3 = 3*( t - 3 ) }}}
(2) {{{ 63 - 3 = 3*( 23 - 3 ) }}}
(2) {{{ 60 = 3*20 }}}
(2) {{{ 60 = 60 }}}
OK