Question on: JAMB Mathematics - 2009
If 55x + 52x = 7710, find x.
A
5
B
6
C
7
D
10
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Correct Option: C
5 x X1 + 5 x XO + 5 x X1 + 2 x XO = 77
5X + 5 + 5X + 2 = 77
10X + 7 = 77
10X = 77 - 7
10X = 70
X = \(\frac{70}{10}\)
= 7
5X + 5 + 5X + 2 = 77
10X + 7 = 77
10X = 77 - 7
10X = 70
X = \(\frac{70}{10}\)
= 7
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