How many mercury Apollos were there?

Answer 1

In the Mercury progam there were 20 unmanned launches; of these four carried monkeys (2 rhesus macaque and 2 chimpanzees); and 6 manned missions. Further missions wre planned, but were cancelled in favour of the Gemini program.

In the Apollo program there were 6 unmanned missions; and 12 manned mission, of these 6 missions landed on the moon.

In addition the four skylab missions used Apollo equipment; as did the Apollo-Soyuz mission. However these were not considered to be part of the Apollo program.

Answer 2

There were a total of eight Mercury missions that were part of the Apollo program. These missions were designed to test various components of the Apollo spacecraft in Earth orbit before attempting lunar missions.