If 1/3 of the eggs were cracked how many were not cracked

1/3 means one third.
There are three thirds in a whole. Third means one part from three equal parts.
If you take one third away from three thirds, you are left with two thirds.
So, if 1/3 (one third) of the eggs were cracked, 2/3 (two thirds) of the eggs were not cracked..
Please ask if this is unclear

Ansradar; im guessing here; good luck : )

Sonar is an application of the doppler effect used by submarines.  this test was on k12.