# Thread: Percentage problem with confusing phrasing

1. ## Percentage problem with confusing phrasing

Hey Guys,

This one seems very simple in (a) and (b) but the phrasing in (c) has me stumped. A hint would be much appreciated!

The pie char shows the proportion of students who travel to school by bus, car, train and on foot.

(a) How many students out of 1440 travel to school by train?
(b) What percentage of the students travel to school by bus?
(c) 96% of the students who live less that two kilometers away from the school walk to school. The remaining 4% travel by car to school. What percentage of all those who travel by car to school live less than 2 km away from the school?

My solution,

(a) Calculate Train angle to 67. Then 67/360*1440 is no of students by train = 268.

(b) % students by bus = 63/360 = 17.5%

(c) The phrasing is confusing me. Does it imply all students who walk are < 2km from school?

2. (c) 96% of the students who live less that two kilometers away from the school walk to school. The remaining 4% travel by car to school. What percentage of all those who travel by car to school live less than 2 km away from the school?

720 students walk to school which is 96% of all people living less than 2kms
So there are 720 / 0.96 = 750 students who live less than 2kms away.
4% of 750 = 30 = no. of students who travel by car.

Now there are: (50/360) (1440) = 200 students travel by car totally.
So answer is 30/200 = 15%

Academy Sigma: Maths Tuition Hong Kong

3. Thanks. So that was the key assumption. I was confused that there could be students who walk to school and are outside the 2km range.