Question

find the value of x

4:x = 20:45
2:7 = x:28
x:3 = 52:39

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Answer 1

Step-by-step explanation:

1. 4:x = 20:45

$\frac{4}{x} = \frac{20}{45} \\ \frac{4}{x} = \frac{4}{9} \\ x = \frac{9 \times 4}{4} = 9$

2. 2:7 = x:28

$\frac{2}{7} = \frac{x}{28} \\ x = \frac{28 \times 2}{7} = 4 \times 2 = 8$

3. x:3 = 52:39

$\frac{x}{3} = \frac{52}{39} \\ \frac{x}{ 3} = \frac{13 \times 4}{13 \times 3} = \frac{4}{3} \\ x = \frac{4 \times 3}{3} = 4$