What does this rebus mean?

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I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Can you spot the hidden girl in the picture below?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I have no life, but I can die. What am I?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

Replace the question mark with the correct number in the below-given picture?