Question

Найдите a, если
1)10:a=4:2
2)a:5=1,6:1 3/5
3)9:3=a:6

Answer 1

$\frac{10}{a} = \frac{4}{2} \\ \\ a=10*2/4=5 \\ \\ \\ \frac{a}{5} = \frac{1.6}{ \frac{8}{3} } \\ \\ a=5*1.6/ \frac{8}{3} =8/ \frac{8}{3} =3 \\ \\ \frac{9}{3} = \frac{a}{6} \\ \\ a=9*6/3=18$