Matt is saving for college. He puts $20 in his savings account each week. How many weeks, w, will it take for him to save $15000?

The equation is 20w=15000

So w=15000/20 = <<15000/20=750>>750. Answer: \boxed{750}.

To calculate the number of weeks it will take for Matt to save $15,000, we can set up an equation.

Let's assume it will take w weeks for Matt to save $15,000.

Each week, Matt saves $20.

So, the equation becomes:

20w = 15,000

To find the value of w, we need to isolate it on one side of the equation.

Dividing both sides of the equation by 20:

w = 15,000 / 20

Simplifying the right side of the equation:

w = 750

Therefore, it will take Matt 750 weeks to save $15,000.

To find the number of weeks, w, it will take for Matt to save $15000, we can set up an equation:

$20 per week * w weeks = $15000

Now, let's isolate the variable w by dividing both sides of the equation by $20:

w = $15000 / $20

Simplifying this expression gives us:

w = 750

Therefore, it will take Matt 750 weeks to save $15000.