Find out the missing number in the picture attached:

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

Which is the rope you never skip with?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

One day Jenifer meets the Lion and the Tiger in the Forest of Forgetfulness. She knows that the Lion lies on Mondays, Tuesdays, and Wednesdays, and tells the truth on the other days of the week. The Tiger, on the other hand, lies on Thursdays, Fridays, and Saturdays, but tells the truth on the other days of the week. Now they make the following statements to Jenifer:

Lion: Yesterday was one of my lying days.

Tiger: Yesterday was one of my lying days too.

What day is it?

Which country gets ill every time?