Question 1095102
The 126 tourists are 3 types:
Let {{{ a }}} = the number of germans
Let {{{ b }}} = the number of French
Let {{{ c }}} = the number of all others
--------------------------------------
{{{ a/b = 3/1 }}}
(1) {{{ a = 3b }}}
---------------------------
{{{ c/b = 2/1 }}}
(2) {{{ c = 2b }}}
---------------------------
(3) {{{ a + b + c = 126 }}}
---------------------------
Plug (1) and (2) into (3)
(3) {{{ 3b + b + 2b = 126 }}}
(3) {{{ 6b = 126 }}}
(3) {{{ b = 21 }}}
and
(1) {{{ a = 3*21 }}}
(1) {{{ a = 63 }}}
and
(2) {{{ c = 2*21 }}}
(2) {{{ c = 42 }}}
-------------------
There are 63 Germans
------------------------
check:
(3) {{{ a + b + c = 126 }}}
(3) {{{ 63 + 21 + 42 = 126 }}}
(3) {{{ 126 = 126 }}}
OK