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Nothing can be added to (the length) 38 cm to make it (the volume) half a litre, however, by multiplyingit by (the area) 133/19 cm2 will make it half a litre.
I suspect that you meant:
What must be added to 38cm3 (thirty eight cubiccentimetres) to make half a litre?
1 litre = 1000 cm3
⇒ 1/2 litre = 500 cm3
Therefore need to add 500 cm3 - 38 cm3 = 462 cm3.
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