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Math problem??? Very Easy, please help!!?
The mean of 3 numbers is 25. The second number is four less than twice the first. The third number is two more than four times the first. Find the smallest number.
Please explain how to do this with the answer!!!
3 Answers
- WaldoBCLv 71 decade agoFavorite Answer
x,y,z
x+y+z=75
y=2x-4
z=4x+2
z=4x+2
or
x = -0.5 + 0.25z
y=2x-4
replace 'x'
y=2(-0.5 + 0.25z)-4
y = -5 + 0.5z
replace 'x & y'
x+y+z=75
(-0.5 + 0.25z)+(-5 + 0.5z)+z=75
z = 46
y = -5 + 0.5z
y = -5 + 0.5(46)
y = 18
x = -0.5 + 0.25z
x = -0.5 + 0.25(46)
x = 11
- 1 decade ago
x=smallest number
(x+(2x-4)+(4x+2)) / 3 = 25
(x+(4x-4)+(4x+2)) = 75
x+2x+4x-2=75
7x-2=75
7x=77
x=11
^.^
