<human>:  Carol has $60 and saves $9 per week. Mike has $90 and saves $3 per week. How many weeks before Carol and Mike both have the same amount of money?
<bot>: Define a variable ** Let x = the number of weeks.
Write an equation ** 60 + 9x = 90 + 3x to set them equal.
Simplify ** 9x = 30 + 3x
Simplify ** 6x = 30
Divide by 6 ** x = <<5=5>>5
How many weeks before Carol and Mike both have the same amount of money? ** In 5 weeks they will have equal money.
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