SOLUTION: Helen earned $400 in January, $450 in February, and $350 in March. To pay all of her bills, she must average at least 430 per month. For waht income in April would her average for

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Question 185270: Helen earned $400 in January, $450 in February, and $350 in March. To pay all of her bills, she must average at least 430 per month. For waht income in April would her average for the 4 months be at least $430?
I have not taken a math class in over 20 years Thanks for the help I don't even know where to begin
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!

To get Average of $430 per month in 4 months, then:
system%28January=400%2C%2BFebruary=450%2CMarch=350%2CApril=x%2CAverage=430%29
It follows:
%28400%2B450%2B350%2Bx%29%2F4=430,Working Eqn; Add & Cross multiply:
1200%2Bx=4%2A430
x=1720-1200=highlight%28520%29, Answer
Let's go back Working Eqn to check:
%28400%2B450%2B350%2Bhighlight%28520%29%29%2F4=430
1720%2F4=430
430=430
Thank you,
Jojo