At a zoo there are kangaroos, giraffes, and tigers. In total, there are 22 heads and 72 feet. If the number of giraffes is equal to the number of tigers, how many of each animal is at the zoo?
+36915 x = tigers and x = giraffes 22-2x = kangaroos
heads = 22
feet = 4x + 4x + 2 (22-2x) = 72
4x = 28
x = giraffes = tigers = 7 each 22-7-7 = then 8 'roos
