Algebra story problem

[darren]

Giant Gym charges a registration fee on $50 plus a monthly fee of $20. Johnny's Gym charges $75 to join, but only $18 a month. After how many months do they cost the same? I don't know how to figure this problem out. Please help. Thanks
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[Deleted member 4993]

Giant Gym charges a registration fee on $50 plus a monthly fee of $20. Johnny's Gym charges $75 to join, but only $18 a month. After how many months do they cost the same? I don't know how to figure this problem out. Please help. Thanks
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What do you need to find?

The no.of months (at which those offers would cost the same)? -- This is your unknown

So name your unknown.

Let the # of month = M

Now continue....

Please share your work with us indicating exactly where you are stuck - so that we may know where to begin to help you.