Question

1)x:9=7:14 2)b:25/6=4/7:20/21

Answer 1

1) 14x=63 разделив обе части на 14 => 9/2 или 4.5

Answer 2

It seems like you've provided two mathematical expressions. Let's break them down:

1. x:9=7:14 This expression appears to be a proportion or ratio equation. The colon ":" represents the ratio between two numbers. The equation can be read as "x is to 9 as 7 is to 14." In other words, the ratio of x to 9 is the same as the ratio of 7 to 14.

To solve for x, you can set up a proportion: x / 9 = 7 / 14

Now cross-multiply and solve for x: x = (7 * 9) / 14 x = 63 / 14 x = 4.5

So, the solution for the equation is x = 4.5.

2. b:25/6=4/7:20/21 Similarly, this expression is a proportion equation involving fractions. It can be read as "b is to 25/6 as 4/7 is to 20/21."

To solve for b, set up the proportion: b / (25/6) = (4/7) / (20/21)

When dividing by a fraction, it's equivalent to multiplying by its reciprocal: b * (6/25) = (4/7) * (21/20)

Now, cross-multiply and solve for b: b = (4 * 21 * 25) / (7 * 20 * 6) b = 525 / 840 b = 0.625

So, the solution for the equation is b = 0.625.