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A three-digit number has hundreds digit [tex]\(h\)[/tex], tens digit [tex]\(t\)[/tex], and units digit [tex]\(u\)[/tex].

Express the following as equations:

1. The sum of the digits is 20.
[tex]\[ h + t + u = 20 \][/tex]

2. The tens digit is three times the sum of the other two digits.
[tex]\[ t = 3(h + u) \][/tex]

3. The number obtained by reversing the order of the digits exceeds the original number by 99.
[tex]\[ 100u + 10t + h = 100h + 10t + u + 99 \][/tex]



Answer :

GinnyAnswer
Let's go through the problem step-by-step and form the corresponding equations.

1. Defining the Digits:
- Let [tex]\( h \)[/tex] represent the hundreds digit.
- Let [tex]\( t \)[/tex] represent the tens digit.
- Let [tex]\( u \)[/tex] represent the units digit.

2. Forming the Equations:

- Equation for the sum of the digits:
We are told that the sum of the digits is 20. This can be expressed as:
[tex]\[ h + t + u = 20 \][/tex]

- Equation for the tens digit:
We are told that the tens digit [tex]\( t \)[/tex] is three times the sum of the other two digits. This can be written as:
[tex]\[ t = 3(h + u) \][/tex]

- Equation for the reversal condition:
The number itself can be represented as:
[tex]\[ 100h + 10t + u \][/tex]
When the digits are reversed, the number becomes:
[tex]\[ 100u + 10t + h \][/tex]
We are also told that this reversed number exceeds the original number by 99:
[tex]\[ 100u + 10t + h = 100h + 10t + u + 99 \][/tex]

3. Simplifying the Reversal Condition:
- Start with the reversal equation:
[tex]\[ 100u + 10t + h = 100h + 10t + u + 99 \][/tex]
- Subtract [tex]\( 10t \)[/tex] from both sides to simplify:
[tex]\[ 100u + h = 100h + u + 99 \][/tex]
- Rearrange terms to isolate [tex]\( h \)[/tex] and [tex]\( u \)[/tex]:
[tex]\[ 100u - u + h - 100h = 99 \][/tex]
[tex]\[ 99u - 99h = 99 \][/tex]
- Divide through by 99:
[tex]\[ u - h = 1 \][/tex]
This can be written as:
[tex]\[ h + 99 = 100u - 10t + u \][/tex]


So, we end up with the following set of equations:

1. [tex]\( h + t + u = 20 \)[/tex]
2. [tex]\( t = 3(h + u) \)[/tex]
3. [tex]\( h + 10t + 100u = 100h + 10t + u + 99 \)[/tex]

These equations represent the conditions stated in the problem.

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