There are 200 students in the group.
To find this, you divide 70 by 0.35 (35%). This will give you 200. To check this, multiply 200 by 0.35 and you will get 70. Thus making 200 the answer.
I hope this helps!
The last set (choice D) is a subset of given set B.
The other 3 choices are wrong.
You would need to know the dimensions of the pyramid and wether it was triangle or square bottomed
The answer is 180 degrees
