If 55\(_x\) + 52\(_x\) = 77\(_{10}\) find X
- 5
- 6
-
7
- 10
The correct answer is: C
Explanation
5 \(\times\) x\(^1\) + 5 \(\times\) x\(^0\) + 5 \(\times\) x\(^1\) + 2 \(\times\) x\(^0\) = 77
(change all to base 10)
5x + 5 + 5x + 2 = 77
10x + 7 = 77
10x = 77-7
10x = 70
x = 70/10
x = 7
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