a number of two digits exceed by 9 the number form by reversing the digit. If the sum of the digits is 13.find the numbers
2 answers:
Let the 2 digit number be 10a + b, where a and b are the tens digit and the ones digit.
Given that
a + b = 13 (equation 1) and
10a + b —9 = 10b + a (equation 2)
So 9a = 9b + 9 , which means
a = b + 1 (equation 3)
Substitute (3) into (1)
(b + 1) + b = 13
2b = 12
b = 6 (equation 4)
Substitute (4) into (3)
a = 6 + 1 = 7 (equation 5)
The 2 digit number is 76.
736 viewsView 1 Upvoter
Related Questions (More Answers Below)
Answer:
This isn’t Spanish, it’s math. Explanation:
You might be interested in
Answer:
El JUGO al futbol
Mi profesora de ciencias ERA muy simpatica
Yo EMPECE a jugar basketball el año pasado
I don’t think there’s a word for that but maybe casanínio
Answer:
what are the options?
Explanation:
The date would be december 31st
The word cocina in English is cooks so that makes it a verb
