When a runner was crossing the 12 km mark

• Percentages

When a runner was crossing the 12 km mark, she was informed that she had completed only 80% of the race. How many kilometres was the runner supposed to run in this event?

1. 14
2. 15
3. 16
4. 16.5

Answer

Let the total length of event be x km.

80% of x = 12

80x/100 = 12

80x = 1200

x = 15

The correct option is B.