Answer :

viceprezCV
10, 20, 30, 40, and 50 are all examples of multiples of 10
the mystery number is between 3x5=15 and 4x7=28
so which number is between 15 and 28 out of all the numbers listed at the very top?
adioabiola

We are required to find the unknown number which is a multiple of 10

The unknown number is 20

  • Multiples of 10: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100......

factors include an even number and an odd number

  • Even numbers: 2, 4, 6, 8, 10, 12, 14, 16, .....

  • Odd numbers: 1, 3, 5, 7, 9, 11, 13, 15, 17,......

3 × 5 = 15

4 × 7 = 28

The inequality:

15 < x < 28

  • 15 less than x and x is less than 28

From the multiples of 10 above, 15 is less than 20 and less than 28

Therefore, the unknown number is 20. the odd factor is 5 and even factors are 2, 4, 10..

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