Question

N stands for a whole number
2n is greater than 30
5n is less than 100
What are all the numbers than n stands for?

Answer 1

2n > 30
5n < 100

2n > 30
÷2    ÷2
n    > 15

5n < 100
÷5      ÷5
 n  < 20

15 < n < 20

n may be 16, 17, 18, or 19