What three ratios are equal to 10: 5?

20:10
25:15
30:20

thats the answer there are more but theres three

You can multiply the first number and multiply the same thing by the second number.
10*5:5*5
50:25

You can also divide by the same number.
10/5:5/5
2:1

X=3 and y=4 is the answer