v1 Measurement, STD2 2012 HSC 26g

Milly purchases a new container of Gutho's Fertilizer which holds 25 kg.

The container comes with a small cup that holds 350 grams of fertilizer when full.

Milly has 5 pot plants that each receive 1.5 cups of fertilizer on the 1st day of the month and 1 cup each in the middle of the month.

Milly begins using this new container on the first day of October.

In what month will her fertilizer run out? Justify your answer with calculations. (3 marks)

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`text(March)`

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`text(Cups used per month)= 5 xx (1.5 + 1)=12.5`

`text(Fertiliser used per month)= 12.5 xx 350 = 4375\ text(g)`

`text(Total fertilizer available)\ = 35\ text(kg) = 35\ 000\ text(grams)`

`text(Time it will last)= (25\ 000)/4375= 5.71…\ text{months}`

`:.\ text(The container will run out in March.)`