How many sides does a circle have?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Highly detail-oriented individuals excel at this type of optical illusion challenge. It requires not just good eyesight but also the ability to distinguish subtle differences quickly. Finding the 6 among all these 9's could indicate a high level of IQ and superior observational skills.

A devotee visits 9 temples when he visits India. All these nine temples have one thing in common - there are 100 steps in every temple. The devotee puts the Re.1 coin after climbing up every step. He does the same while climbing down every step. At each temple, the devotee offers half of his money from his pocket to god. In this way, his pocket becomes empty after he visits the 9th temple.

Can you calculate the total amount he had initially?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT