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\frac{-4}{9}\div\frac{8}{-15} is equal to:
For all non-zero rational numbers a, b, c: (a \div b) \div c = a \div (b \div c).
The product of two rational numbers is \frac{-28}{45}. If one of them is \frac{7}{-9}, find the other. (Give your answer as a decimal.)
A ribbon 7\frac{1}{2} m long is cut into pieces, each \frac{3}{4} m long. How many pieces are obtained?
Verify a \times (b + c) = a \times b + a \times c for a = \frac{-3}{4}, b = \frac{2}{5}, c = \frac{-5}{6}.
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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