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Question 207912This question is from textbook prentice hall mathematics course 1
: a three digit whole numbers last digit is three times its first digit.its first digit is two times its second digit. what is the number. please help me I asked my older brother for help but he didn't know i thought maybe it was 246, but i don't think thats right.Pleas help me, thank you so,so much!!!
This question is from textbook prentice hall mathematics course 1
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Let x = 100's digit (1st digit)
Let y = 10's digit
Let z = units (last digit
:
Write an equation for each statement:
:
": a three digit whole numbers last digit is three times its first digit."
z = 3x
For z to be a single digit, x can only be 1, 2, or 3
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"its first digit is two times its second digit."
x = 2y
x has to be an even number if y is multiplied by 2
:
That leaves x=2
then
y = 1
and
z = 3(2) = 6
:
what is the number. 216
:
Make sense?
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