I think 30??
Because if there are twice as much girls then 10*2=20 girls and 10 boys. So 20+10=30
D) 800 because you can’t get 400 if you didn’t flip the coin over 400 times.. this is because the coin has a 50/50 chance of heads or tails so you double the expectation
Answer:
Step-by-step explanation:
-
0.20x- 0.35x=-0.5 +0.75
-0.15x=0.25
x=0.25/0.15
1.6666666666666666666666666666667 =10/6