Question

There are 40 minutes to solve a test of 60 questions. A student completes 20 questions in 20 minutes
He continues with the same speed and leaves the hall 10 minutes earlier. The number of questions solved by him?
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Answer 1

the answer was to leave

Answer 2

He solved 20 questions in 20 mins.
That means, 1 question in 1 min.

From that, remaining 20 minutes and he left the hall 10 minutes earlier, therefore, we left with only 10 minutes.
In 10 minutes, he'd have solved 10 more questions.

Therefore, 10+20=30 questions he solved in total.

Answer 3

:D

Answer 4

i don't know