Question

I have a two digit number the sum of the digits is 12 the first digit is 4 Less Than 3 times the second what is my number​

Answer 1

84

Explanation:

Let the first digit = x

Let the second digit =y

x + y = 12

x + 4 = 3*y

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From the second equation, we learn that x = 3y - 4

Put that into the first equation.

3y - 4 + y = 12 Combine the left side

4y - 4 = 12 Add 4 to both sides

4y = 16 Divide by 4

4y/4 = 16/4

y = 4

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x + 4 = 12

x + 4 - 4 = 12-4

x = 8

So the number is 84