Question

What is a rational number between 7.7 and 7.9

Answer 1

Hey mate ,

here is your answer

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The average between any two rational numbers is also rational.
(7.7 + 7.9)/2 = 7.8
7.8 is rational because it can be written as a fraction with integer numerator and denominator (39/5) and it is also a terminating decimal.

Answer 2

7.8 because it is a terminating decimal.