Answer:
Step-by-step explanation:
[tex]13) \dfrac{5}{x}=\dfrac{20}{16}[/tex]
In the numerator, 20 ÷ 4 = 5
So, x = 16 ÷ 4 = 4
5 : 4 = 20:16
14)
[tex]\dfrac{2}{9}=\dfrac{12}{x}[/tex]
In the numerator, 2*6 = 12
So, x = 9*6 = 54
2:9 = 12 : 54
15) [tex]\dfrac{x}{1}=\dfrac{30}{3}[/tex]
In the denominator 3 ÷ 3 = 1
So, 30 ÷ 3 = 10
10 : 1 = 30 : 3
[tex]16)\dfrac{x}{5}=\dfrac{21}{35}[/tex]
In the denominator, 35 ÷ 7 = 5
x = 21 ÷ 7 = 3
3 : 5 = 21 : 35
[tex]17) \dfrac{21}{x}=\dfrac{7}{2}[/tex]
In the numerator, 7 *3 = 21
So, x = 2*3 = 6
21: 6 = 7 : 2
