Answer:

14 is answer

We're looking for Common Multiples - numbers that list both 2 and 7 as factors.

Since both 2 and 7 are prime, there's no need to look at what their factors are - they are 1 and themselves.

And so a quick way to find a multiple of 2 and 7 is to multiply them:

2

×

7

=

14

We can now multiply 14 by any number and get another common multiple of 2 and 7. For instance, if we multiply by 10, we get:

14

×

10

=

140

In order to arrive at 140, we need both a 2 and 7 in the factor tree, making them common factors.

Answer:

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