A certain car traveled twice as many miles from Town A to Town B as it did from Town B to Town C. From Town A to Town B, the car averaged 20 miles per gallon, and from Town B to Town C, the car averaged 24 miles per gallon. What is the average miles per gallon that the car achieved on its trip from Town A through Town B to Town C?  Choose the correct choice from the following answers
A) 40  B) 30  C) 42  D) 33  E) 35
step 1) took LCM of 20 and 24.. came as 120.   step 2) 120 distance between B to C... do 120/24 hence 5 gallons used   step 3) twice distance.. hence 120*2= 240... do as above.. 240/20= 7 gallons used   step 4) total gallons.. 5+7= 12 gallons   step ) total miles= 120+240= 
<gadget id="calculator">120+240</gadget>
<output>360</output>
360 miles   hence.. average of whole journey= 360/12 which comes to 30   Answer : 30
<result>B</result>
A certain car traveled twice as many miles from Town A to Town B as it did from Town B to Town C. From Town A to Town B, the car averaged 20 miles per gallon, and from Town B to Town C, the car averaged 24 miles per gallon. What is the average miles per gallon that the car achieved on its trip from Town A through Town B to Town C?