So the price of the bike is increased by 30%. If we assume the original price of the bike is b, 125= b+0.3*b = 1.3(b). We rearrange this, dividing 1.3 on both sides of the equation, and we get 125/1.3 = (roughly) 96.15$. Checking, we add (0.3)(96.15) = 28.85, 96.15+28.85 = 125$.
Reach out if you need any help.
Never mind, I found out how to do it, but it appears that your answer is wrong?
So I think we might use the hockey stick thereom thing...
it's C(n+k-1, k-1).
So if the twins each get 0, we have 6 candy, 6+(5-2)-1 = 8. 5-2-1=2. C(8,2).
We also get C(6,2), C(4,2), C(2,2), and c(0,2) with increasing values
Adding these together we get 50.
Based on my knowledge on bacteria, the growth isn't uniform, but it doesn't make sense unless if a LOT die every hour... I'll do two cases for each scenario.
If the growth is uniform, 7200-6000 = 1200. Since it's 3 hours, 1200/3 = 400/hour. I'm not sure if it's 19 hours AFTER the original 3 hours or after the starting time. Either multiply 400 by 19 or 16.
If the growth isn't uniform: I'm pretty sure bacteria doubles... but there are a bunch of cases so I'm afraid I can't help you... sorry... if you have anyquestions please ask...