book Maths Puzzle Numerical Ability

Could you please help me factor this problem? 1-125b^3

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book Other Question

The sum of three times a number and 7 more than the number is the same as the difference between -11 and twice the number. What is the number?
An airplane flew for 4 hours with a 20-km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air.