There is an orange tree on the top of the mountain. A monkey ate the oranges secretly. It ate (1/10) on the first day, and ate (1/9), (1/8), ( 1/7)...(1/3), (1/2), after 9 days of stealing, there are still 10 oranges left on the tree, how many oranges are left on the tree.
山顶上有棵橘子树，一只猴子偷吃橘子，第一天偷吃(1/10)，以后8天分别偷吃了当天现有橘子的(1/9)、(1/8)、(1/7)…(1/3)、(1/2)，偷了9天，树上还留下10只橘子，问树上原有多少只橘子．
<gadget id="calculator">90 + 10</gadget>
<output>100</output>

<result>100</result>