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Very good! You had \(10\) to begin with, you gave away \(4\). But, obviously, in total, there are still \(10\) chocolates. So, chocolates only changed hands.
Imagine there are two cars travelling at \(40 \, \mathrm{km/h}\). They are travelling in opposite directions and unfortunately crash into each other and stop moving. Before they crashed, if you added their speeds, you would get \(40 + 40 = 80 \, \mathrm{km/h}\).
After the crash, what is true about the sum of their speeds?
  • It is \(< 80 \, \mathrm{km/h}\)
  • It is \(= 80 \, \mathrm{km/h}\)
  • It is \(> 80 \, \mathrm{km/h}\)