36, 54 and 72
36, 54, 72, and 90.
U={whole number greater than 10 but smaller than 30 } X={numbers divisible by 3 } Y Odd numbers
There are infinitely many prime numbers which are greater than 30.
23 and 29 are the two prime numbers greater than 20 but less than 30.
Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
That's an infinite list.
U={whole number greater than 10 but smaller than 30 } X={numbers divisible by 3 } Y Odd numbers
There are infinitely many prime numbers which are greater than 30.
23 and 29 are the two prime numbers greater than 20 but less than 30.
Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
There are 15 composite numbers greater than 50 but less than 70
The numbers 23 and 29 are prime.
The numbers that are divisible by both 3 and 5 have to be a factor of 15. That leaves 15, 30, 45, 60, 75, and 90. There are 6 numbers less than 100 divisible by 3 and 5
Hmm...perhaps you should be doing your own work, but here's my answer: Yes to both. 90 ends in 0 and is less than or greater than 5, so it is divisible by 5. 30 is divisible by 6, and 90 is divisible by 30, so 90 is also divisible by 6.
There are 30 such numbers.
There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28
That's an infinite list.
23