Question

4:5=х:100
12:х=23
1)
$\frac{7}{15} \frac{x}{45}$
2)
$\frac{9}{x} \frac{3}{7}$
3)
$\frac{3}{23} \frac{2}{7} \frac{1}{4}$
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Answer 1

1) 4:5= х: 100

5х= 100:4

5х= 20

х= 20:5

х=4