Answer:
Marc's age is 12
Step-by-step explanation:
Let
x ----> Marc's age
y ---> Tony's age
z ---> Ben's age
we know that
the sum of their ages is 40
so
-----> equation A
Marc is half as old as Tony
so
----> equation B
Marc is three times as old as Ben
so
![x=3z](https://tex.z-dn.net/?f=x%3D3z)
----> equation C
substitute equation B and equation C in equation A
![x+2x+\frac{x}{3}=40](https://tex.z-dn.net/?f=x%2B2x%2B%5Cfrac%7Bx%7D%7B3%7D%3D40)
solve for x
![\frac{10x}{3}=40](https://tex.z-dn.net/?f=%5Cfrac%7B10x%7D%7B3%7D%3D40)
![x=40(3)/10\\x=12\ years](https://tex.z-dn.net/?f=x%3D40%283%29%2F10%5C%5Cx%3D12%5C%20years)
therefore
Marc's age is 12
It depends on how many people you are feeding
Answer:
He will have 22 blueberries
Step-by-step explanation:
Johnny ate 10 which makes him left with 2 blueberries
Jena then gave him 20.
20 + 2 = 22