book Maths Puzzle Numerical Ability

if 5 x 10n = 0.005, then n=

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book Other Question

How do I round 0.00000226 to the nearest tenth,hundred ,thousand? Hi,I need help with 2 problems here.

I need to find the value of x

1: log x 361/25 = 2

2:I need to assume that x, y and z are positive numbers, use the properties of log