A student adds \(\tfrac35\) unit of a solution, then adds 0.4 unit of the same solution, and finally removes \(\tfrac1{10}\) unit. What is the net change in the quantity of the solution?
increase of 0.9 unit
Net change: \(\tfrac35+0.4-\tfrac{1}{10} = 0.6+0.4-0.1 = 0.9\).
Hence, the net change in the quantity of the solution is an increase of 0.9 unit.
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