16. 4 schools sent students to a languages course. One of the schools sent both French and German students. The ratio of French to German students it sent was 1 : 3 The school sent 21 German students. The other 3 schools sent the same number of students.
Work out the total number of students sent to the languages course.
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language course=4
Ratio of number of French students to the number of German students=1:3
Total number of German student=21
Then, let the number of students who took French be x.
This can be written as:-
Thus, the number of students who took French=7
Which means :-
The total number of students sent to the language course:-
Thus, the total number of students sent=28
Therefore, the total number of students sent to the language course =28
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