Question

What would Martin's actual personal expenses for that school year have to be so that his amount and his co-students' amounts together would have an average of $2,850?

Answer 1

Based on the given information, Martin asked his 7 co-students. Together with him, they will be 8.

Let's multiply 8 by the average personal expenses which is $2, 850.

$8\times2,850=22,800$

Hence, for them to have an average of $2,850 in their personal expenses, their total expenses must be $22,800.

Now, let's add the expenses of the 7 students.

$2,500+2,600+3,000+3,200+2,700+2,900+2,850=19,750$

The total expense of the 7 students is $19, 750.

Let's subtract $19, 750 from $22, 800.

$22,800-19750=3,050$

Therefore, Martin's actual personal expenses for that school year have to be $3, 050 so that his amount and his co-students amounts together would have an average of $2,850.