If 55x + 52x = 7710 find X

Assessment: JAMB UTME - Mathematics - 2009 Subject: General Mathematics

Question 1 Report

If 55x + 52x = 7710 find X
Answer Details
5*X1 + 5*X ∘  + 5*X1 + 2*X ∘  = 77 (change to base 10)
5*X + 5*1 + 5*X + 2*1 = 77
5X + 5 + 5X + 2 = 77
10X + 7 = 77
10X = 77-7
10X = 70
X = 70/10
X = 7

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