You have a five-litres jug, a three-litres jug, and unlimited supply of water. How would you come up with exactly four litres of water (with no measuring cup)?
You fill the 5-litres jug, and pour it into the 3-litres jug until it's full (now you have 2 litres in the 5-litres jug). Then, you pour out the 3-litres jug completely. Now, you pour the 2 litres from the 5-litres jug into the 3-litres jug. Lastly, you fill the 5-litres jug and pour it into the remaining space of the 3-litres one (one more litre). Now you're left with 4 litres in the 5-litres jug.
DG
Related Maths A Level answers
All answers ▸The curve C has the equation 4x^2 - y^3 - 4xy + 2y = 0 . The point P with coordinates (-2, 4) lies on C. Find the exact value of dy/dx at the point P.
How would I differentiate a function such as f(x)=x^3(e^(2x))?
How do rearrange y to make it the subject of an equation?
For sketching the graph of the modulus of f(x) (in graph transformations), why do we reflect in the x-axis anything that is below it?