Question

I am a factor of 40.
When you pair me with 15, we have an LCM of 15.
I am not 1.
What is the mystery number?
PLEAASEEEE HELPPPPPPP

Answer 1

Answer:

I think it’s 5

Step-by-step explanation:

Answer 2

The mystery number is 5.

The mystery number is a factor of 40 so the first thing to do is to list the factors of 40:

• 1
• 2,
• 4,
• 5,
• 8,
• 10,
• 20,
• 40

The number also has to be a factor of 15 because only a number that is a factor of 15 can have 15 as a multiple.

Factors of 15 are:

• 1,
• 3,
• 5,
• 15

The only number appearing on both lists is 5 so we can conclude that 5 must be the mystery number.

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