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xbeatdroperzx
27.06.2019 •
Mathematics
The sum of my digits is an even number. my first digit is 6 less than my second digit. 12 is the number you get when you add my digits. what number am i?
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Ответ:
39
Step-by-step explanation:
Let a and b represent the first and second digits, respectively.
... a = b -6 . . . . . . the first digit is 6 less than the second
... a + b = 12 . . . . .the sum of digits is 12 (an even number)
Using the expression in the first equation, we can substitute for a in the second equation:
... (b -6) +b = 12
... 2b = 18 . . . . . . add 6, simplify
... b = 9 . . . . . . . . .divide by 2
... a = 9 -6 = 3 . . . . from the first equation
The number is 39.
Ответ:
4/6
6/9
8/12
10/15