Makahanap ng mga eksaktong solusyon sa iyong mga problema gamit ang IDNStudy.com. Ang aming komunidad ay handang magbigay ng malalim at maaasahang mga sagot, anuman ang kahirapan ng iyong mga katanungan.

the sum of digits of a two-digit number is 12. the value of the number is two more than 11 times the tens digit. find the number.
please help me with this..


Sagot :

Let 'x' be the number on the tens place 
      'y' be the number on the units place
      'x(10)+y' be the number
----------------------------------------------------
From the statement 'the sum of a two-digit number is 12'
x + y = 12   ----equation 1
----------------------------------------------------
From the statement 'the value of the number is two more than 11 times the tens digit'
x(10) + y = 11x + 2
 10x + y = 11x + 2
11x - 10x = y - 2
 x = y -2       -----equation 2
----------------------------------------------------
Substitute equation 2 to equation 1
x + y = 12
y - 2 + y = 12
y+ y = 12 + 2
2y = 14
y = 7
----------------------------------------------------
Substitute y=7 to equation 1
x + y = 12
x + 7 = 12
x = 12 - 7
x = 5
---------------------------------------------------
The number as stated above is x(10) + y
10x + y = 10(5) + 7
             = 50 + 7
             = 57
---------------------------------------------------
Therefore the number is 57.