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Using suitable rearrangement, find: \frac{3}{7}+\frac{-6}{11}+\frac{-8}{21}+\frac{5}{22}
What number should be added to \frac{-5}{12} to get \frac{3}{8}?
Verify that x + y = y + x for x = \frac{-7}{10} and y = \frac{5}{-8}.
Simplify using suitable properties and give the answer as a decimal: \frac{2}{5}\times\frac{-3}{7}-\frac{1}{14}-\frac{3}{7}\times\frac{3}{5}
Verify that (a + b) + c = a + (b + c) for a = \frac{-2}{3}, b = \frac{5}{6} and c = \frac{-7}{12}.
A tank holding 1200 litres when full is \frac{3}{4} full. In the morning, \frac{1}{3} of the water in the tank is used. In the evening, \frac{2}{5} of the remaining water is used. How many litres of water are left in the tank?
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