8. When astronauts Antoine Weber and Rachel Sun landed on the hypothetical planet Trifour they found the inhabitants had either 3 or 4
extremities. Weber could not look at the inhabitants' faces so he just
counted their extremities. Hecounted 173 extremities. Sun, on the
other hand, could not look at their extremities so she just counted faces.
She counted 51 faces. How many inhabitants had 3 extremities? How
many were there that had 4 extremities?