Question 964051
Let {{{ s }}} = Samy's age now
Let {{{ r }}} = Rubina's age now
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(1) {{{ s = 2*( r - 2 ) }}}
(2) {{{ s - r = 2 }}}
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(2) {{{ s = r + 2 }}}
Substitute (2) into (1)
(1) {{{ r + 2 = 2*( r - 2 ) }}}
(1) {{{ r + 2 = 2r - 4 }}}
(1) {{{ r = 2 + 4 }}}
(1) {{{ r = 6 }}}
and
(2) {{{ s = r + 2 }}}
(2) {{{ s = 6 + 2 }}}
(2) {{{ s = 8 }}}
Samy is 8 today
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check:
(1) {{{ s = 2*( r - 2 ) }}}
(1) {{{ 8 = 2*( 6 - 2 ) }}}
(1) {{{ 8 = 2*4 }}}
(1) {{{ 8 = 8 }}}
OK