medium · GMAT Quant
Battery Bank 1 and Battery Bank 2 together store a constant 400 kilowatt-hours (kWh) of electrical energy. Initially, Bank 1 holds 300 kWh more than Bank 2. Energy is transferred between the banks without loss until Bank 2 holds 3 times as much energy as Bank 1.
How many kilowatt-hours of energy were transferred from Bank 1 to Bank 2?
- 50
- 100
- 200
- 250
- 350
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