Question 1119712
Let {{{ a }}} = Brendan's age now
Let {{{ b }}} = Jason's age now
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(1) {{{ a = 5b - 3 }}}
(2) {{{ a + b = 81 }}}
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Plug (1) into (2)
(2) {{{ 5b - 3 + b = 81 }}}
(2) {{{ 6b = 84 }}}
(2) {{{ b = 14 }}}
and
(1) {{{ a = 5*14 - 3 }}}
(1) {{{ a = 70 - 3 }}}
(1) {{{ a = 67 }}}
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Brendon is 67
Jason is 14
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check:
(1) {{{ 67 = 5*14 - 3 }}}
(1) {{{ 67 = 70 - 3 }}}
(1) {{{ 67 = 67 }}}
and
(2) {{{ 67 + 14 = 81 }}}
(2) {{{ 81 = 81 }}}
OK