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OpenStudy (anonymous):
The sum of the digits of a two digit number is 11 and the difference of the digit is 5. What is the number?
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OpenStudy (aakashsudhakar):
x+y=11 x-y=5 Basic algebraic substitution follows. I'd recommend substituting 5-y for x (from the second equation).
OpenStudy (loser66):
apply this trick big + small = sum big - small = dif big = (sum + dif )/2 small = (sum -dif) /2
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