book Maths Puzzle Numerical Ability

Solve the equation

100e^-0.6=20

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book Other Question

A crew of 6 men can complete the construction of an office in 60 days. In order to speed up the job the contractor increases the size of the crew by 1/3. How many days will he save by the addition of these men? I don't understand how to do some of these problems. If you can help me, how do you solve Matrix products and how do you simplify expressions?