#### Answer

Does not make sense

#### Work Step by Step

As per the given statement, we can have the expression such as:
$x+y=\dfrac{2800}{7}$ and $x-y= \dfrac{2800}{5.6}$
Thus , we have two linear equations after solving theses equations we can find the two unknown variables x and y.
This information is useful to find the two unknown variables x and y.
Hence, The given statement does not make sense