Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

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?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

A pet show was happening in my locality. I went down along with my kids. In that show, I noticed that all except two of the entries were cats. All except two were dogs and all except two were Monkeys.

Can you find out how many of each animals were present in that pet show?

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

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What do you think with the below Picture ?

Our product and our sum always give the same answer. Who are we?

John had a bag containing colourful marbles. The colours are red, green and blue. The total number of marbles he had in his bag was 60. There are 4 times as many red marbles as green marbles. 6 more blue marbles than green marbles. How many marbles of each colour did John have?

What's the only room from which no one can enter or leave