book Maths Puzzle Numerical Ability

Hi I am having diffuclties setting up this problem:

If 46 painters used 70 nails in 90 days how many nails would 23 painters use in 60 days?

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book Other Question
What kind of prperty is 1x4=4? I need help evaluating this expression:

Log base 10 multiplied to (.01) raised to the 3rd power

Thanks
Michael V