Can you replace the question mark with the correct number?

Find out the missing number in the picture attached:

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Can you make four (4) nines (9) equal 100?

I am sure no one can have two things for dinner. what are they?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Identify the hidden meaning behind this picture?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?