Question

The first common multiple of 2, 5, and 4 is .

• A. 20
• B. 24
• C. 30

Answer 1

The correct option is A 20

Multiples of 2 are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ...

Multiples of 5 are 5, 10, 15, 20, 25, 30, 35, ...

Multiples of 4 are 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, ...

So, the first common multiple of 2, 5, and 4 is 20.