Question

15:х=5:7​

Answer 1

Ответ:

15:х=5:7

Х*5=15*7

5х=105

Х=105:5

Х=21

Answer 2

To solve the proportion $15:x=5:7$, you can use the cross-multiplication method. Cross-multiplication involves multiplying the extremes (the numbers on the outer sides) and the means (the numbers on the inner sides) of the proportion.

So, in this case:

$15 \cdot 7 = 5 \cdot x$

Now, calculate each side:

$105 = 5x$

To find the value of $x$, divide both sides by 5:

$x = \frac{105}{5} = 21$

So, the value of $x$ in the proportion $15:x=5:7$ is 21.