Logic puzzle - Taxi fare

Three friends took a taxi from Orchard to the Singapore Zoo. When they arrived at the zoo, the meter read $25. Each of the friends gave the taxi driver a $10 note. The taxi driver handed them five $1 notes as change. Each of the friends took one of the $1 notes. They gave the taxi driver the remaining two $1 notes as a tip.

Each of the friends had spend $9 and and the taxi driver had $2, bringing the total to $29. What happened to the last $1?

The answer will be disclosed in the next post on Friday. Happy Solving!

Answer to Math Puzzle

Pour the water in the second glass to the fifth glass as shown in the diagram below:

Happy Lunar New Year!

Math Puzzle Involving Divergent Thinking

Six drinking cups are arranged in a row as shown below. The first three are filled with water while the next three are empty. Move one glass only to get the full and empty glasses to alternate.

We will publish the answer to the puzzle next week. Happy solving!