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GB-10-05-001 · Fraction of a remainder

A tank contains 880 litres of water. 15\frac{1}{5} of the water is used on Monday. On Tuesday 18\frac{1}{8} of the remaining water is used. Work out how much water is left.

Fractions of Remainders Application of related method — Booklet p. 19
Method
1) Subtract fraction used from 1 to find fraction remaining at each stage
2) Multiply initial amount by each remaining fraction
Worked Example (GB-10-05-001)
1)
After Monday: 880 × 45\frac{4}{5} = 704 litres.
2)
Multiply this by 78\frac{7}{8}.
3)
616 litres
Ans = 616 litres