Question

4:5=х:100 12:х=231)2)3)​

Answer 1

1) 4:5= х: 100

5х= 100:4

5х= 20

х= 20:5

х=4

Answer 2

To solve these proportions, you can use cross-multiplication.

1. For the first proportion, 4:5 = x:100:

Cross-multiply:

4 * 100 = 5 * x

400 = 5x

Now, solve for x by dividing both sides by 5:

x = 400 / 5 x = 80

So, the value of x is 80.

2. For the second proportion, 12:x = 231:

Cross-multiply:

12 * 231 = x

2760 = x

So, the value of x is 2760.