Directions : These questions are based on the following table : **Weight distribution in the average adult** | Organs | Weight (in grams) | |---|---| | Muscles | 30000 | | Skeleton | 10000 | | Blood | 5000 | | Gastrointestinal tract | 2000 | | Lungs | 1000 | | Liver | 1700 | | Brain | 1500 | The ratio expressed in decimals of the weight of the brain to the weight of the lungs is

### Concept & Base-10 Division When formulating a ratio where the denominator is a power of $10$ (like $10$, $100$, $1000$), you can instantly convert it to a decimal by shifting the numerator's decimal point leftward by the number of zeros in the denominator. $$ \text{Ratio} = \frac{\text{Weight of Brain}}{\text{Weight of Lungs}} $$ ### Step-by-Step Solution * Extract the brain's weight from the data table: $1500$ grams. * Extract the lungs' weight from the data table: $1000$ grams. * Construct the fraction to find the ratio: $$ \frac{1500}{1000} $$ * Because the denominator is $1000$, identify the decimal point at the end of $1500.0$ and move it three places to the left. $$ 1500 \div 1000 = 1.500 $$ * Drop the trailing zeros to get the simplified decimal form: $1.5$. ### Exam Strategy & Shortcut Spotting a denominator of $1000$ means no manual division is necessary. The brain is $1500$ and the lungs are $1000$; visually inspecting the numbers shows that $1500$ is exactly one and a half times $1000$, leading immediately to the decimal $1.5$. ### Common Pitfall Reversing the terms to calculate lungs over brain ($1000 \div 1500$), which simplifies to $2/3$ or approximately $0.67$. This does not match any options and forces you to restart the problem. ### Final Answer Therefore, the correct answer is **$1.5$**.