A heating oil supplier tops up a farm's storage tank. Before the driver's visit, the tank held an unknown amount of oil. During the visit the driver adds 14...
Question 1 Report
A heating oil supplier tops up a farm's storage tank. Before the driver's visit, the tank held an unknown amount of oil. During the visit the driver adds 145.5 litres, bringing the tank's reading up to 210.25 litres.
Work out how many litres of oil were held in the tank before the driver's visit. (3)
Answer Details
This question tests finding an original quantity by subtracting an amount added from a final total.
The oil in the tank before the visit is the final reading minus the amount added: \(210.25 - 145.5 = 64.75\) litres [3 marks].
Since topping up increased the tank's reading, reversing the process to find the starting amount means subtracting the amount delivered from the final reading.
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