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OpenStudy (anonymous):
The sum of the digits of a two digit number is 12. The number is 7 times the sum of it's digits. What's the number?
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OpenStudy (oaktree):
If the number is 10a + b, then:
OpenStudy (oaktree):
a+b=12, and 10a+b=7(a+b)
OpenStudy (oaktree):
So, 10a+b
OpenStudy (anonymous):
i got it from there. Thank you!
OpenStudy (oaktree):
Is equal to 84.
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