# Use CPLEX solver in JuMP
**URL:** https://discourse.julialang.org/t/use-cplex-solver-in-jump/100048
**Category:** Optimization (Mathematical)
**Tags:** question, jump
**Created:** [June 8, 2023, 12:16pm UTC](https://discourse.julialang.org/t/use-cplex-solver-in-jump/100048 "2023-06-08T12:16:30Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@R0033h](https://discourse.julialang.org/u/R0033h)
#### Post date: [June 8, 2023, 12:16pm UTC](https://discourse.julialang.org/t/use-cplex-solver-in-jump/100048/1 "2023-06-08T12:16:30Z")
I am a new learner to Julia and I would like to know how can create subproblem. I tried many ways but all of them not correct. the problem is ( we assumed: there are
400 students and
4 schools each school have 100 students
every 100 student there are 30 students face difficulty with learning math,
then we have 2 student guide for each school
. How can create subproblem during 3 days a week.
i applied Benders decomposition and did not work may i did not write in a correct way.
---
### Author:  [@gdalle](https://discourse.julialang.org/u/gdalle)
#### Post date: [June 8, 2023, 1:02pm UTC](https://discourse.julialang.org/t/use-cplex-solver-in-jump/100048/2 "2023-06-08T13:02:34Z")
Hi @R0033h and welcome!
Can you be more specific regarding what you’re trying to do? What do you mean by subproblem? This might also be a useful read
> [@Please read: make it easier to help you](https://discourse.julialang.org/t/please-read-make-it-easier-to-help-you/14757):
>
> Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …
In any case, [JuMP’s documentation](https://jump.dev/JuMP.jl/stable/) is a really great starting point to learn both Julia and numerical optimization software!