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 25 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 options: A) 20 B) 18 C) 21.4 D) 16 E) 10
step 1) took LCM of 20 and 25.. came as 100.   step 2) 100 distance between B to C... do 100/25 hence 4 gallons used   step 3) twice distance.. hence 100*2= 200... do as above.. 200/20= 10 gallons used   step 4) total gallons.. 4+10= 14 gallons   step ) total miles= 100+200= 
<gadget id="calculator">100+200</gadget>
<output>300</output>
300 miles   hence.. average of whole journey= 300/14 which comes to 21.4   Answer : 21.4
<result>C</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 25 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?