How make this passive to active voice : think about how many people feel this way in this world due to depression and how many of those people are teenagers who have not been cured.

'Let it be thought about how many people feel this way in this world due to depression and how many of those people are teenagers who have not been cured'.

Explanation:

The sentence is the given question is an imperative sentence. Here we are being either ordered or requested to think about something important. When converting an imperative sentences which means an order, the following format is followed.

Let + object + be + past participle form.

In the given sentence, the main verb, 'think' has been changed to the past participle form. All the other parts of the sentence have been rearranged to fit the format for a passive voice.