Answer:
F
Step-by-step explanation:
Let the number of birds flying in group be "x"
When said, we need HALF of us, it means, HALF of x, or [tex]\frac{1}{2}x[/tex]
And then, plus the new bird (1 only) to make 100, so we can say:
[tex]x+\frac{1}{2}x+1=100[/tex]
Now, we can solve the equation algebraically to get "x", to get the number of birds flying:
[tex]x+\frac{1}{2}x+1=100\\1.5x+1=100\\1.5x=100-1\\1.5x=99\\x=\frac{99}{1.5}\\x=66[/tex]
Answer is 66
Answer choice F is right
