exam Maths Puzzle Numerical Ability

The tens digit of a number exceeds the units digit by 2. The sum of the digits is 1/7 of the number. What is the number?

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exam Other Question

Factor completely.
16x^2 - 2x - 3 One computer can process a payroll in 60 minutes. A newer computer can process a payroll in 40 minutes. How long would it take to process the payroll if both computers worked together?