Question 598926
Let {{{ t }}} = Mrs. Taylor's age now
Let {{{ s }}} = her Son's age now
given:
(1) {{{ t = 4s }}}
(2) {{{ t + 20 = 2*( s + 20 ) }}}
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(2) {{{ t + 20 = 2s + 40 }}}
(2) {{{ t = 2s + 20 }}}
Substitute (1) into (2)
(2) {{{ 4s = 2s + 20 }}}
(2) {{{ 2s = 20 }}}
(2) {{{ s = 10 }}}
and
(1) {{{ t = 4s }}}
(1) {{{ t = 4*10 }}}
(1) {{{ t = 40 }}}
Mrs. Taylor is 40
Her Son is 10