Hello I think the answer would be three.
Answer: 6 students
What we know:
Students: 24
Students who play checkers: 
Students who also play sudoku:
of the 
24 ÷ 3 = 8, so 8 × 2 = 16 (students who play checkers)
× 2 = 
So the answer is,
6 students play both checkers and sudoku
Answer:
2
Step-by-step explanation:
Its the only graph that matches.
Yeah because he was at least 80% and when you add the grain and carbon that was total. Then divide the carbon. It will be 80%