Please contact your life or study to work out a practical problem. The equation is 55-x = 45 + X

Please contact your life or study to work out a practical problem. The equation is 55-x = 45 + X


There is a pile of 55 apples, which are eaten by the children. There is another pile of 45 plums. The teacher added the same number of plums as the apples eaten. Finally, the two piles of fruits are equal in quantity. How many apples did the children eat?