A fish tank is currently holding 230 mL of water. If we add on another 140 mL, the tank will be full. How much water is needed to make the tank full? (If the tank currently has 230 mL.)
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The fish tank currently holds 230 mL of water, if we add on 140 mL, it will have 370 mL. Therefore, the capacity of the whole fish tank is 370 / 7 1 = 2590 mL. 5 1 of the tank would therefore be 518 mL (2590 * 5 1 ). 518 - 230 = 288 mL needed to fill the tank to 5 1