Multiple choice general knowledge math & puzzles

There is a bus with 7 boys inside. Each boy has 7 bags. Inside each bag there are 7 dogs. Each dog has 7 puppies. All dogs & puppies have 4 legs each. The total number of legs in the bus =..(its not a trick.Straight forward question)

  1. 70

  2. 10990

  3. 9609

  4. 1384

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

7 boys × 2 legs = 14 legs. 7 boys × 7 bags = 49 bags. 49 bags × 7 dogs = 343 dogs × 4 legs = 1372 legs. Each dog has 7 puppies = 343 × 7 = 2401 puppies × 4 legs = 9604 legs. Total legs in bus = 14 + 1372 + 9604 = 10990 legs.