exam Maths Puzzle Numerical Ability

the additve inverse of a number divided by twelve is the same as one less than three times its reciprocal.

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exam Other Question

Two surveyors with two-way radios leave the same point at 9:00 A.M., one walking due south at 4 mi/hr. How long can they communicate with one another if each radio has a maximum range of 2 miles? what is the circumference of a circle