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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