Chapter 4 - Decimals - 4.1 Reading and Writing Decimal Numbers - 4.1 Exercises - Page 274: 71

$$ 20,500,000,000$$

To write 20.5 billion as a number without a decimal place, we must identify which digit each number is. We see that the "2" is the 11th digit, the zero is the 10th digit, and the 5 is the 9th digit. All other digits are zero. Thus, the number is: $$ 20,500,000,000$$