SOLUTION: the sum of three numbers is 75.the second number is 5 more than 4 times the first, and the third is 2 times the first.find the second number

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Question 342491: the sum of three numbers is 75.the second number is 5 more than 4 times the first, and the third is 2 times the first.find the second number
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A,B and C be the numbers.
1.A%2BB%2BC=75
B=5%2B4A
C=2A
Substitute into eq. 1,
A%2B5%2B4A%2B2A=75
7A%2B5=75
7A=70
highlight%28+A=10%29
.
.
.
B=5%2B4%2810%29
highlight%28+B=45%29
.
.
.
C=2%2810%29
highlight%28+C=20%29