While some written math problems are easier solved if you draw a diagram, some written math problems are beyond solution. Not because they are intractably difficult, but because the author is an idiot, the publisher is an idiot, the ‘education’ body that chose the idiot question by the idiot author, and the idiot teacher (using that word in it’s broadest sense), is innumerate and unable to see that the question cannot be solved with the information given. Here’s an example:

Go ahead. There is no solution to the problem as presented. If you see crap like this showing up in assignments then COMPLAIN long and hard. Ask your child’s math ‘teacher’ how to solve it with only the information given. Students aren’t born stupid but crap like that make them give up math ASAP.