Question

calcule o valor de x na proporções
x /21 = 13/7

3/x= 12/20

2x/15= 6/9 7/6=28/x

Answer 1

$\frac{x}{21} = \frac{13}{7} =\ \textgreater \ 7x=273=\ \textgreater \ x=39$

$\frac{3}{x} = \frac{12}{20} =\ \textgreater \ 12x=60=\ \textgreater \ x=5$

$\frac{2x}{15} = \frac{6}{9} =\ \textgreater \ 18x=36=\ \textgreater \ x=2$

$\frac{7}{6} = \frac{28}{x} =\ \textgreater \ 7x=168=\ \textgreater \ x=24$