2009
Mathematics
JAMB
If 55x + 52x = 7710 find X
A.
5
B.
6
C.
7
D.
10
Correct Answer: 7
Explanation
5 × x1 + 5 × x0 + 5 × x1 + 2 × x0 = 77. (change all to base 10) 5x + 5 + 5x + 2 = 77 10x + 7 = 77 10x = 77-7 10x = 70 x = 70/10 x = 7
5 × x1 + 5 × x0 + 5 × x1 + 2 × x0 = 77. (change all to base 10) 5x + 5 + 5x + 2 = 77 10x + 7 = 77 10x = 77-7 10x = 70 x = 70/10 x = 7THIS WEEK's
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