SOLUTION: lauren earns the same amount for mowing four of the neighbours lawns every month. each month she saves all her pay except $30, which she spends on her mobile phone. if she has $600

Question 1093271: lauren earns the same amount for mowing four of the neighbours lawns every month. each month she saves all her pay except $30, which she spends on her mobile phone. if she has $600 at the end of the year, how much did she earn each month?
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
x equals what she earns each month.
x - 30 is what she keeps each month.

at the end of the year, she has 600.

12 * (x-30) = 600

x - 30 = 600 / 12 = 50.

add 30 to both sides to get x = 80.

she earns 80 dollars each month.

she saves 50 and spends 30.

at the end of the year she has saved 12 * 50 = 600 and she has spent 12 * 30 = 360.

her total revenue for the year was 12 * 80 = 960.

600 was saved.
360 was spent on the mobile phone.

you could also have done:

600 / 12 = 50 dollars she saves every month.

add 30 that she spent on the mobile phone and she earned 80 dollars each month.

comes out to be the same thing but without the algebraic notation.

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