Answer:
10:12, 20:24, 15:18, 30:36, 40:48
Explanation:
To find ratios equivalent to 5:6, just multiply both sides (or divide) by the same number (in order to keep it proportional to 5:6)
For example:
10:12 = 5:6
Multiply 5 by 2 to get 10, and multiply 6 by 2 to get 12
Another example:
20:24 = 5:6
Multiply 5 by 4 to get 20, and multiply 6 by 4 to get 24.
Make sure not to switch the places of numbers.
Side note:
If you still don't understand, try this way: 5:6 is a ratio, but it can be written as the fraction 5/6.