Q. Last weekend, I went to play in the nearby park. It was real fun! I rode my new bicycle that Mom had gifted me on my birthday.

On reaching the park, I saw that there were a total of 8 bicycles and tricycles. If the total number of wheels was 20, how many tricycles were there?

Ans. Assuming 2 wheels for each cycle, 8 cycles will have 16 wheels. But, there are 20 − 16 = 4 extra wheels.

As bicycles have 2 wheels and tricycles have 3 wheels, there is 1 extra wheel per tricycle in the park. Thus, the 4 extra wheels belong to 4 tricycles.