With the help clues provided in the image, can you find the 5 digit key?

Be active and find the killer in the picture Riddle below.

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

In the image below, can you find the value of an angle(y)

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

I have Rs.50 and I spend it in the way as below.

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?