Homework Help: Algebra math.

Posted by Lucy on Tuesday, January 4, 2011 at 8:29pm.

1) the sum of the digits of a two digit number is 9. The value of the number is 12 times the tens digit. Find the number.

2) the sum of the digits of a two digit number is 12. If 15 is added to the number the result is 6times the units digit. Find the number.

Please help!!

Thanks (:

Algebra math. - Reiny, Tuesday, January 4, 2011 at 8:59pm
let the unit digit by x
let the tens digit be y
so x+y=9, both x and y being whole numbers

value of number = 10y+x

given: 10y+x = 12y
or x = 2y
back in the first:
x+y=9
2y+y=9
y=3, and thus x = 6
the number is 36

let's see you do the second question in the same way.
Algebra math. - Lucy, Wednesday, January 5, 2011 at 12:36am
Thanks ! This really helped (:

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