How many snakes and how many lizards are in the cage if they have 30 heads and 76 legs together?

According to the condition of the problem, it was said that there were 76 legs, since snakes have no legs, which means that only lizards have all 76 legs. From this it follows that we must divide the number of legs by the number of legs of one lizard. One lizard has 4 legs.
1. Find how many lizards were in the terrarium.
76/4 = 19 lizards
2. In the second step, we calculate how many snakes were in the terrarium, subtract the number of lizards from the number of heads.
30-19 = 11 snakes
Answer: There were only nineteen lizards and eleven snakes in the terrarium.