solve的名詞是什麼

例句：

The problem can be solved in all manner of ways.

這個問題可以用各種方法加以解決。

She tried her best to solve the problem.

她盡了最大的努力解決這個問題。

Attempts are being made to solve the problem of waste disposal.

正在想辦法解決廢物處理的.問題。

This won't solve the problem but it's a step in the right direction.

這雖不能解決問題，卻是朝正確方向邁出的一步。

It is questionable whether this is a good way of solving the problem.

這未必是一個解決問題的好辦法。