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*Maths for All*volume 1 costs 70 euros.

*Maths for All*volume 2 costs 40 euros.

The department wants twice as many copies of volume 1 as volume 2.

How many of each volume can they buy?"

I got up to that the first equation is 70x + 40y= 1440, but I have no idea how to proceed after that. How do I get a constant in the second equation? I'm lost.