Answer:
B) 4
Step-by-step explanation:
To find what values of a,b and c should be 2,3 and 5 such that the expression results in the greatest value possible.
We need to first simplify the expression, so that we can easily understand it.
![\dfrac{\dfrac{a}{b}+1}{\dfrac{c}{b}}](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Cdfrac%7Ba%7D%7Bb%7D%2B1%7D%7B%5Cdfrac%7Bc%7D%7Bb%7D%7D)
firstly, just break apart the fractions so we have two separate fractions instead one long fraction.
![(\dfrac{a}{b}+1)\div(\dfrac{c}{b})](https://tex.z-dn.net/?f=%28%5Cdfrac%7Ba%7D%7Bb%7D%2B1%29%5Cdiv%28%5Cdfrac%7Bc%7D%7Bb%7D%29)
division and multiplication are reciprocal to each other!
![(\dfrac{a+b}{b})\times(\dfrac{b}{c})\\](https://tex.z-dn.net/?f=%28%5Cdfrac%7Ba%2Bb%7D%7Bb%7D%29%5Ctimes%28%5Cdfrac%7Bb%7D%7Bc%7D%29%5C%5C)
finally the b's cancel out, making our problem even simpler.
![\dfrac{a+b}{c}](https://tex.z-dn.net/?f=%5Cdfrac%7Ba%2Bb%7D%7Bc%7D)
Now, in order to have this expression give the largest possible value, we'll need to have:
- the larger values at the numerator i.e (3,5)
- smaller values at the denominator i.e (2)
![\dfrac{a+b}{c}](https://tex.z-dn.net/?f=%5Cdfrac%7Ba%2Bb%7D%7Bc%7D)
![\dfrac{3+5}{2}](https://tex.z-dn.net/?f=%5Cdfrac%7B3%2B5%7D%7B2%7D)
![\dfrac{8}{2}=4](https://tex.z-dn.net/?f=%5Cdfrac%7B8%7D%7B2%7D%3D4)
so B) 4 is the right answer!