Sunday

April 20, 2014

April 20, 2014

Posted by **Joe Mhar Plaza** on Thursday, January 6, 2011 at 10:34pm.

- Exploring mathematics elementary algebra -
**Reiny**, Thursday, January 6, 2011 at 10:52pmDid you mean the "sum of the digits of a two-digit number is 15" ?

if so, then

let the unit digit be x

let the tens digit be y

so the value is 10y + x

"One third of the number diminished by 12 is 17"

---> (1/3)(10y+x) - 12 = 17

(1/3)(10y+x) = 29

multiply by 3

10y+x = 87

x = 87 - 10y

also x+y = 15

by substitution:

87-10y + y = 15

-9y = -72

y = 8

x = 87 - 80 = 7

the number is 87

check the properties stated.

**Related Questions**

Exploring mathematics elementary algebra - The units digits of a two-digit ...

exploring mathematics elementary algebra - the sum of the digits of a two-digit ...

tres ninos school - exploring mathematics elementary algebra....the sum of the ...

Exploring mathematics elementary algebra - The tens digit of a two-digit number ...

Exploring mathematics elementary algebra - the units of a two-digit number ...

Algebra math. - 1) the sum of the digits of a two digit number is 9. The value ...

maths - Find the sum of all 3-digit positive numbers N that satisfy the ...

Mathematics - There is a two-digit number such that the sum of its digit is 6 ...

Mathematics - There is a two-digit number such that the sum of its digit is 6 ...

Math - Algebra - What is the linear equation that will represent the second ...