Step-by-step explanation:
Let X = the number of days.
For growth rate,
y = X° × rate of growth, k
Where,
X° = initial amount of bacteria
k = rate of growth per day
Colby = 50 bacteria
kc = 2^(24/2 × X)
y = 50 × 2^(12X)
Jaquan = 80 bacteria
kj = 2^(24/3 × X)
y = 80 × 2^(8X)
Total price paid : 86=12*X+10*Y
Total number of people : 8=X+Y
Hence Y=8-X thus 86=12*X+10(8-X) => 86-80=2X => X=3 => Y=5
There were 3 adults and 5 children
Keep change flip=
7/3x3/2
Threes cancel out=
7x1/2
7/2 is answer.
