Question

type the correct answer in the box. anna used 900 gallons of gasoline last year driving to and from work. this year, she changed jobs. she now uses only 600 gallons of gas annually. if each gallon of gas releases 20 pounds of co₂ when burned, anna reduced her co₂ emissions by %.

Explanation:

Step1: Calculate last - year emissions

Last year, Anna used 900 gallons of gas. Since each gallon releases 20 pounds of $CO_2$, last - year emissions = $900\times20 = 18000$ pounds.

Step2: Calculate this - year emissions

This year, Anna uses 600 gallons of gas. So this - year emissions = $600\times20=12000$ pounds.

Step3: Calculate the reduction amount

The reduction in emissions = $18000 - 12000=6000$ pounds.

Step4: Calculate the percentage reduction

The percentage reduction formula is $\frac{\text{Reduction amount}}{\text{Original amount}}\times100\%$. So the percentage reduction = $\frac{6000}{18000}\times 100\%=\frac{1}{3}\times100\%\approx33.33\%$.

Answer:

$33.33$