The centre of the third figure is empty. What digit should fit inside?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

what does the below rebus mean?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

When can we add 2 to 11 and get 1 as the correct answer?

Why is a river so rich ?