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A tank was filled with 300 ltr of water. During the day, 87 ltr 225 ml of water was used. How much water was left in the tank at the end of the day?
212 ltr 775 ml
212 ltr 675 ml
212 ltr 875 ml
212 ltr 825 ml
212 ltr 775 ml
Since the used amount is 87.225, subtract 88 from 300 to get 212, then subtract the fractional part 0.225 from 1.000 to get 0.775.
Initial water in the tank = 300 litres. Water used = 87 litres 225 ml.
1 litre=1000 ml
Since the used amount is 87.225, subtract 88 from 300 to get 212, then subtract the fractional part 0.225 from 1.000 to get 0.775.
Many students subtract 225 from 1000 thinking in decimal/units incorrectly or forget that 300 litres is actually 299 litres 1000 ml.
Convert Units
To make the subtraction easier, convert the initial total volume into litres and millilitres: 300 litres=299 litres+1000 ml.
300 l=299 l 1000 ml
Perform Subtraction
Subtract the used amount (87 l 225 ml) from the converted total (299 l 1000 ml). Subtracting litres: 299−87=212. Subtracting millilitres: 1000−225=775.
(299−87) l (1000−225) ml=212 l 775 ml
A is correct because the result of the subtraction 300 l−87 l 225 ml is exactly 212 l 775 ml.
This type of unit subtraction is common in distance and weight problems (e.g., kg and grams or km and meters) where borrow-from-the-higher-unit logic is required.
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