Harry is driving from Christchurch to Nelson – a distance of 420 kilometres.
• He stops for petrol in Kaikoura, which is 4/7 of the distance from Christchurch.
• The petrol tank holds 55 litres and is 2/11 full at Kaikoura before he buys more petrol.
• Harry buys 40 litres of petrol at Kaikoura.
• He drives the rest of the way to Nelson and uses 1 litre of petrol every 12 kilometres.
How much petrol is left in the tank when Harry gets to Nelson?

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?