You and a friend join a gym the registration fee is $30 and the monthly membership is $20 if the total bill for you and your friend is $420 how many months did you pay for?

9 months for each person.

First, divide by two, so you are only working with one person’s money. 420 / 2 = 210

Now subtract the $30 registration fee. 210 - 30 = 180

Finally, divide by $20 to find the number of months. 180/20 = 9

So, you and your friend each paid for 9 months.

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