Question

Решите пропорцию
1 19/20:(х+4)=2 1/6:2 2/9

Answer 1

39/20 (х+4)=13/6÷20/9
39/20 (х+4)=13/6×9/20
39/20 (х+4)=39/40
х+4=39/40÷39/20
х+4=39/40×20/39
х+4=1/2
х=1/2-4
х=3 1/2