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Question

A3B and when A = 3, B = 27.
If B = 125, then find the value of A.


Correct Answer
A
5
Your Answer
B
10
Your Answer
C
25
Your Answer
D
125

Solution

The correct option is A 5
Given, A3B 
Let the constant of variation be k.
A=k3B
Given, at A = 3, B = 27.
So, k=A3B =3327=33=1.
Hence, at B = 125, the value of A is given by:
A=k3B=(1)(3125)=(1)(5)=5

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