What happened when the wheel was invented?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

Can you solve the maths in the below-given picture equation?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Can you find out the remainder when 3^300 is divided by 5?

Dwayne Johnson was running away with the loot from a heist in his car along with Vin Diesel. One tire was punctured and he dropped down to replace it. While changing the wheel, he dropped the four nuts that were holding the wheel and they fell into a drain. Vin Diesel gave him an idea using which they were able to drive till the rendezvous point.

What was the idea ?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?