Question 1029440
Let {{{ j }}} = John's age now
Let {{{ s }}} = Sam's age now
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(1) {{{ j = 3s }}}
(2) {{{ j + 5 = 2*( s + 5 ) }}}
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(2) {{{ j + 5 = 2s + 10 }}}
Substitute (1) into (2)
(2) {{{ 3s + 5 = 2s + 10 }}}
(2) {{{ s = 5 }}}
and
(1) {{{ j = 3s }}}
(1) {{{ j = 3*5 }}}
(1) {{{ j = 15 }}}
John is 15 and Sam is 5
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check:
(2) {{{ j + 5 = 2*( s + 5 ) }}}
(2) {{{ 15 + 5 = 2*( 5 + 5 ) }}}
(2) {{{ 20 = 2*10 }}}
(2) {{{ 20 = 20 }}}
OK