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G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

Order a 12-month Year 7 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 8 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 9 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 10 Interactive Maths software Homework Licence for only $19.95.

Year 10 Interactive Maths - Second Edition


Problem Solving

Direct proportion (or variation) has applications in areas including travel, science, economics, accounting, business, geography and cooking.


Example 11

If the number of litres of petrol used by a car varies directly as the distance travelled and the car uses 16 litres of petrol on a trip of 80 km, how many litres will it use on a trip of 235 km?

Solution:

Let the number of litres used and the distance travelled in kilometres be denoted by n and d respectively.

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