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Q: What are the numbers less than 20 that are multiples of 4 and 5?

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All numbers have an infinite amount of multiples.

45, 54

Three of them.

5, 10 and 15 are three multiples of 5 less than 20. 10 is even.

6, 12, 18

Everything up to and including 20.

12

10 and 20

There are 7 such numbers: 4, 8, 12, 16, 20, 24, 28.

5, 10, 15, 20, 25, 30, 35, 40.

They are members of the set of numbers of the form 140*k where k is a positive integer less than 6.

All the prime numbers less than 20 are 2,3,5,7,11,13,17,19

Multiples of 3 less than 20 are {3,6,9,12,15,18}.

Leaving out non-positive multiples, the answer is 5, 10, 15 and 20.

1, 2, 3, 4

5, 10, 15, 20.

5, 10, 15, 20

23 and 29 are the two prime numbers greater than 20 but less than 30.

19 is a prime number less then 20

1,2,4,5,10,20

All the numbers from 2 to 19 are multiples of prime numbers.

21

The multiples of 4 that are less than 30 are 4, 8, 12, 16, 20, 24, 28

All those not less than 20.

5, 10, 15, 20, 25