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saturns

80

The question implies that you're counting by tens & the number comes after 70 and before 90. This is the only number that fits this description.

fichoh

Using logical concept, the value of the number in question will be 80.

Let the number be n ;

  • Value before, n = 70

  • Value after, n = 90

  • Difference between n and the preceeding and succeeding values is 10

Hence, we have ;

70, n, 90

n - 70 = 10 - - (1)

90 - n = 10 - - - (2)

Using either of the two expressions, we can obtain the value of n :

n - 70 = 10

n = 10 + 70

n = 80

Hence, the number is 80

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