What is X of Y

• What is 30 of 100?
• What is 20 of 200000?
• What is 20 of 40?
• What is 15 of 200?
• What is 15 of 80?
• What is 16 of 225?
• What is 25 of 80?
• What is 15 of 70?
• What is 20 of 80?
• What is 20 of 70?
• What is 20 of 65?
• What is 20 of 600?
• What is 20 of 400?
• What is 20 of 85?
• What is 20 of 60?
• What is 20 of 55?
• What is 20 of 50?