The greatest common factor of a and B is 3 and the least common multiple is 30. It is known that a is 6 and B is 1______ ．

The answer is: the number B is 15, so the answer is: 15

RELATED INFORMATIONS

1. A = 2 × 3 × 5 × 7, B = 2 × 3 × 11, the greatest common factor of a and B is______ The least common multiple is______ ．
2. A = 2 × 3 × 5 × 7, B = 2 × 5 × 11, the greatest common divisor of a and B is______ The least common multiple is______ ．
3. The number a is three times the number B, and the sum of the two numbers a and B is 96. Find the least common multiple and the greatest common factor of the two numbers a and B
4. A = 2 * 3 * 7, B = 2 * 5 * 7, what is the greatest common factor and the least common multiple of a and B?
5. The greatest common factor of two numbers is 15, and the least common multiple is 90. What is their product?
6. The greatest common factor of the two numbers is 15, and the least common multiple is 90. These two numbers are () A. 15 and 90B. 30 and 60C. 45 and 90
7. The greatest common factor of two numbers is 15, and the least common multiple is 90. These two numbers may be () and several (), or () and ()
8. Odd number, even number, prime number, composite number, prime number, common multiple, what is the largest and the smallest common factor? I said, what are the largest and smallest of the above numbers?
9. (1) What are the characteristics of common multiple and least common multiple? (2) what are the characteristics of prime number? (3) what are the characteristics of composite number?
10. The greatest common factor of the smallest prime number and the smallest composite number is ()
11. The greatest common factor of a and B is 3 and the least common multiple is 30. It is known that a is 6 and B is 1______ ．
12. If the number a is 30, then the number B is (), if the number B is 90, then the number a is (), 60 seconds
13. The least common multiple of two numbers is 180 and the greatest common factor is 30. One of them is 90 and the other is 30______ ．
14. The least common multiple of two numbers is 180 and the greatest common factor is 30. One of them is 90 and the other is 30______ ．
15. The least common multiple of two numbers is 180 and the greatest common factor is 30. One of them is 90 and the other is 30______ ．
16. The sum of the greatest common factor and the least common multiple of a number is 42 emergency
17. If the greatest common factor of two numbers is 7 and the least common multiple is 42, one of them is 21 and the other is what
18. The greatest common factor of two numbers is 1, and the least common multiple is 42?
19. If the greatest common divisor of two numbers is 42, the least common multiple is 2940, and the sum of the two numbers is 714, then the two numbers are______ ．
20. The greatest common factor of the two numbers is 42, the least common multiple is 1940, and the sum of the two numbers is 714. What are the two numbers