Question

My bank account has $300 in it. I start saving each week. In 3 weeks, I have $375 in it.
What is the x-variable

Answer 1

If x is the amount you get per week, and x is constant, then you can do the following:

375-300=75 (How much you got in 3 weeks)

3*x=3x (3 weeks times the constant amount of money you get per week)

3x=75

x=25

Answer 2

Savings for 3 weeks = current balance - account balance before three weeks
= 375 - 300 = 75 for 3 weeks
Hence for one week 75/3 = 25
OR
300 + 3 x X = 375
3 x X = 375 - 300
3 x X = 75
X = 75/3
X= 25