Name a key which is hardest to turn.

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 ?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

How many times can you subtract the number two from the number fifty?

Identify the hidden meaning behind this picture?

In the image given, you can find several triangles. Can you count them all?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You can hear me, but you can't touch or see me.

What am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209