Question 945803
Let {{{ a}}} = number of local visitors
Let {{{ b }}} = number of overseas visitors
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(1) {{{ a + b = 133 }}}
(2) {{{ (1/4)*a = (3/7)*b }}}
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(2) {{{ 7a = 12b }}}
(2) {{{ b = ( 7/12 )*a }}}
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by substitution:
(1) {{{ a + ( 7/12 )*a = 133 }}}
(1) {{{ ( 19/12 )*a = 133 }}}
(1) {{{ a = ( 12/19 )*133 }}}
(1) {{{ a = 84 }}}
and, since
(1) {{{ a + b = 133 }}}
(1) {{{ 84 + b = 133 }}}
(1) {{{ b = 49 }}}
The number of local visitors is 84
The number of overseas visitors is 49
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(2) {{{ (1/4)*a = (3/7)*b }}}
(2) {{{ (1/4)*84 = (3/7)*49 }}}
(2) {{{ 21 = 21 }}}
OK