The average of two numbers is 7. Find the numbers if three times one of the numbers is one half the other number. (Hint: write a
system to determine the correct numbers)
1 answer:
(x+y) / 2 =7
multiply both sides by 2
x+y=14
3x=.5y
divide both sides by .5
6x=y
plug 6x in for y
x+(6x)=14
simplify
7x=14
divide both sides by 7
x=2
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Step-by-step explanation:
x + y = 27
We know that there are 5 less girls that boys, so:
x + (x-5) = 27
x + x - 5 = 27
Solve for x:
2x - 5 = 27
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tell me if you see anything wrong
