Candle shortening time: 18-8= 10 (minutes)
The shortened length of candle is: 12-7=5 (cm).
So the burning length of candle per minute is: 5/ 10=0.5 (cm/min).
The length of the candle burned in the first 8 minutes is: 0.5X8=4cm
So the original length of the candle is: 4+ 12= 16cm.
A: The candle was originally 16cm long.
Tisch
The study and life in the second day of junior high school is really a little tired, but in class, we have gained a lot of ha