First one: Since we know that its 12, we just need to change it into a percentage. 12 out of 30 would be 40%. So the answer is 40%
Second one: 60 - 30 = 30. We know 30 is half of 60 so 50%. The answer is 50%
Third one: 16 - 4 = 12. 12 of 16 is 75%. The answer is 75%.
