Level 3 There are some horses, ducks and cows in a farm.There are 3 times as many ducks as cows. Jade finds out that among the animals, there are a total of 34 heads and 100 legs. How many horses are there?
Level 2
Xavier, Kevin and John had a total of 126 stamps. Xavier had twice as many stamps as Kevin and John had twice as many stamps as Xavier. How many stamps did Kevin have?