Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Find the value of "a" by solving the maths equation in the picture below:

What question can you never answer yes to?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

John walks into the daily grocery shop and steals a $100 bill from the shop. An hour later John returns to the shop and buys some daily products for $40. John pays the owner the $100 bill and therefore the owner returns him $60.

How much money did the owner lose?

The richest man in the city Mr Rechard is kidnapped. James Bond is appointed to the case. At the crime scene, a note is found written by Mr Richard. The note read:

"First of January, Fourth of October, Fifth of March, Third of June."

James Bond knew that somehow, the killer's name was hidden in the note. The following were the suspects:

Jack Richard, the son and the heir of property.
John Jacobson, the employee of Richard.
June Richard, the wife of Richard.

James Bond took only a few moments to deduce the killer's name. Can you tell who was the killer?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Which of the eight images will fill the missing image in the puzzle below?