Te Arapiki Ako
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17. Example 4 – Spray Output – continued

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Last updated 26 October 2012 15:30 by NZTecAdmin

The question often asked by learners is ‘What does the 600 mean?'
The short answer is that it is the constant that ties together all of the different units that are used in the formula. The longer answer provides an opportunity to build linear, problem-solving thinking skills – numerate behaviour.

We want to end up with litres per hectare, or .

A hectare is unit of measure for area: 100 m x 100 m or 10 000 m2
Notice that the rate in the top line is a per minute rate and bottom line rate is per hour.

If the output is 1 litre per minute, that is 60 litres per hour. Multiplying the litres/min value by 60 gives litres/hour:

Litres per minute x 60 = litres per hour



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