Each car can hold 5 students and each minibus can hold 15 students. There will be 85 students on the trip.
Let x be the number of cars and y the number of minibuses they will need.
1. Write an equation in x and y for the number of students on the trip.

5x+15y=85

Step-by-step explanation:

X and Y are the unknown variables, just add them to 5,(cars), and 15 (minibus)

No , the cause and effect can be finished up through analyses as it were.  

What we have in the inquiry is only an observational investigation where we basically study 3000 grown-ups and attempt to outline the outcomes with no trial proof.  

Imagine a scenario in which individuals who had breakfast normally were inclined to maintain their weight reduction, for sure if individuals who keep up weight reduction will in general have breakfast routinely.  

henceforth the circumstances and logical results relationship cannot be built up  

So as to do so , one must lead measurable trials, for example, autonomous example t test or ANOVA examination