Multiple choice general knowledge math & puzzles

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 12 bicycles and tricycles. If the total number of wheels was 30, how many tricycles were there?

  1. 8

  2. 10

  3. 6

  4. 9

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let B be bicycles and T be tricycles. B + T = 12 and 2B + 3T = 30. From the first eq, B = 12 - T. Substitute: 2(12 - T) + 3T = 30 => 24 - 2T + 3T = 30 => T = 6. There are 6 tricycles.