exam Maths Puzzle Numerical Ability

-tu-vw=t Solve for v.

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exam Other Question

Use a calculator to approximate x to 3 deciaml places
Ln x=.988 I have 2.686=x
Log x =3.1 I have x=.491
Could you please tell me if this is right?
Also Use : A=P(1+r/n)^nt or
8/5x = 9 , x+4/7=3/5 , evaluate: ab+abc-bc if a=3,b=12 and c=1/6 ,

use two unit multiplyers to convert 74 kilometers to centimeters ,