SOLUTION: 2/5 of the sum of two numbers is is 18. one of the numbers is 30, what is the other number?

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Question 727027: 2/5 of the sum of two numbers is is 18. one of the numbers is 30, what is the other number?
Answer by rm29924(97) About Me  (Show Source):
You can put this solution on YOUR website!

Let x=the other number
2/5(x+30)=18
2/5x+2/5(30)=18
2/5x+12=18
2/5x=6
multiply both sides by 5 to get rid of the fraction
2x=30
X=15