Quantitative Aptitude – Algebra – Logarithms – If log(base2)(5 + log(base3) a)
Slot -1 – Quantitative Aptitude – Algebra – Logarithms – If log(base2)(5 + log(base3) a)
If log2(5 + log3a) = 3 and log5(4a + 12 + log2 b) = 3, then a + b is equal to?a) 59
b) 40
c) 67
d) 32
Solution:
Given, log2(5 + log3 a) = 3
5 + log3 a = 2^3 = 8
log3 a = 3
so a = 3^3 = 27
Now log(base5) (4a+12+log(base2) b)=3
Or 4a + 12 + log(base2) b) = 125
log(base2) b = 125-12-4×27=5
So b = 2^5 = 32
Thus a+b = 59
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