If 21x = 79x, what is the value of x?

What Does this text mean:

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They are three errirs in this question. Can you find them?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What four weights can be used to balance from 1 to 30 pounds?

A cat, a dog and a monkey were stolen. 3 suspects got caught: Harish, Manoj and Tarun. All we know is each person stole one animal, but we do not know who stole which. Here are the investigation statements. Harish said: Tarun stole the cat. Manoj said: Tarun stole the dog. Tarun said: They both were lying. I did not steal the cat or the dog. Later on, the police found out the man who stole the monkey told a lie. The man who stole the cat told the truth. Can you find out who stole which?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

what does the below rebus means?

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?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?